NLE Hematologic Nursing — Hematologic Assessment and the AnemiasRevision Notes
Final-week revision notes for Hematologic Assessment and the Anemias. If you have already studied the full chapter, this page is your go-to refresher before sitting the NLE. Compact, high-yield, and aligned with what Professional Regulation Commission (PRC) — Board of Nursing tests in the Hematologic Nursing subtest.
Exam context
For the Philippine Nurse Licensure Examination (PNLE), Professional Regulation Commission (PRC) — Board of Nursing tests Hematologic Nursing under a "Core" label, with Hematologic Assessment and the Anemias in the 1st slot across 2 chapters. NLE candidates must clear the 75% weighted average with no sub-test below 60% cut on the 2026 paper, which draws about 50 Hematologic Nursing questions. Date to watch: Bi-annual.
Hematologic Assessment and the Anemias - Revision Notes
The hematologic system is a high-yield topic in the Philippine NLE, appearing consistently in NCM 103 (Care of Clients with Problems in Oxygenation) and related medical-surgical nursing content. This chapter covers the essential skills every Filipino nurse must master: interpreting the complete blood count (CBC), understanding blood group compatibility, and differentiating the four major anemias — iron-deficiency, pernicious, aplastic, and hemolytic. Mastery of this material supports safe, evidence-based nursing practice as mandated under RA 9173 (Philippine Nursing Act of 2002), which requires nurses to demonstrate competence in health assessment, clinical monitoring, and therapeutic management. Use these notes for focused, systematic review of all NLE-critical concepts.
Sections
Exam Tips
- NLE questions often test the relationship between kidney disease and anemia — always link EPO deficiency to kidney failure.
- Remember the '120-day rule' for RBC lifespan; this explains why chronic blood loss (not acute) depletes iron stores over time.
- The spleen is the KEY organ for filtering old RBCs — splenomegaly in hemolytic anemia is a compensatory response to increased RBC destruction.
Key Points
- Blood is composed of plasma and formed elements; all formed elements are produced in bone marrow through hematopoiesis.
- Erythrocytes (RBCs) carry oxygen via hemoglobin; they live approximately 120 days and are stimulated by erythropoietin released by the kidneys in response to hypoxia.
- Leukocytes (WBCs) defend the body against infection; types include neutrophils, lymphocytes, monocytes, eosinophils, and basophils.
- Thrombocytes (platelets) initiate hemostasis (clotting); normal lifespan is 8–10 days.
- The spleen filters aged RBCs and stores platelets; the liver produces most clotting factors and stores vitamin B12, iron, and folate.
- Erythropoietin (EPO) is the key hormonal regulator of RBC production — kidney disease reduces EPO, causing anemia of chronic kidney disease.
- Hematopoiesis occurs in the red bone marrow of flat bones (sternum, pelvis, ribs) in adults.
Definitions
Term
Hematopoiesis
Definition
The process of blood cell formation occurring in the bone marrow, producing RBCs, WBCs, and platelets from stem cells.
Importance
Understanding hematopoiesis explains why bone marrow failure (aplastic anemia) causes pancytopenia affecting all blood cell lines simultaneously.
Term
Erythropoietin (EPO)
Definition
A glycoprotein hormone produced mainly by the kidneys in response to hypoxia; stimulates the bone marrow to increase RBC production.
Importance
Clinically relevant in chronic kidney disease where reduced EPO output leads to normocytic, normochromic anemia.
Term
Hemoglobin (Hgb)
Definition
The iron-containing protein within RBCs that binds and transports oxygen from the lungs to tissues and carbon dioxide back to the lungs.
Importance
Hemoglobin level is the primary measure used to diagnose and grade the severity of anemia.
Section Title
Overview of the Hematologic System
Common Mistakes
- Confusing the functions of leukocytes and erythrocytes — remember: RBCs carry oxygen, WBCs fight infection, platelets clot.
- Forgetting that erythropoietin is produced by the KIDNEYS, not the bone marrow; students often confuse the site of production with the site of action.
- Overlooking the liver's role — the liver produces clotting factors AND stores B12, iron, and folate, making hepatic disease a contributor to multiple hematologic problems.
- Assuming all blood cells live the same length of time — RBCs: 120 days, platelets: 8–10 days, WBCs: hours to days.
Exam Tips
- NLE clinical scenarios frequently describe a patient with 'pale conjunctiva and spoon-shaped nails' — this is iron-deficiency anemia.
- A scenario describing 'pallor + paresthesias/numbness of hands and feet + beefy red tongue' = pernicious anemia (B12 deficiency).
- The presence of ALL THREE: pallor, recurrent infections, AND petechiae/bleeding = aplastic anemia (pancytopenia).
- In the Philippines, malnutrition and heavy menstrual blood loss are the most common causes of iron-deficiency anemia in the primary health care setting.
Key Points
- A thorough history includes: fatigue, dyspnea, pallor, dizziness, bleeding or bruising, recurrent infections, diet (iron, B12, folate intake), medications (anticoagulants, NSAIDs, chemotherapy), and family history of blood disorders.
- In Filipino patients with darker skin tones, pallor is best assessed at the conjunctiva, nail beds, and palms — NOT solely at the face.
- Jaundice in hematologic conditions signals hemolysis (increased bilirubin from RBC destruction); cyanosis signals severe hypoxia.
- Compensatory signs in anemia: tachycardia, tachypnea, and a systolic flow murmur (increased cardiac output to deliver more oxygen despite low Hgb).
- Petechiae (pinpoint), purpura (larger), and ecchymoses suggest thrombocytopenia or coagulopathy.
- Glossitis (inflamed tongue) and angular cheilitis (mouth corner cracks) indicate iron or B12 deficiency.
- Koilonychia (spoon-shaped nails) is a classic sign of chronic iron-deficiency anemia.
- Neurologic changes (paresthesias, ataxia) specifically suggest vitamin B12 deficiency — NOT iron deficiency.
- Lymphadenopathy and splenomegaly suggest malignancy, hemolysis, or infection.
Definitions
Term
Koilonychia
Definition
Spoon-shaped (concave) nails caused by chronic iron deficiency; the nail plate loses its normal convexity and becomes flattened or scooped inward.
Importance
A pathognomonic physical sign of chronic iron-deficiency anemia; commonly tested in NLE scenario-type questions.
Term
Glossitis
Definition
Inflammation of the tongue causing redness, soreness, and a smooth appearance; seen in both iron-deficiency and B12 deficiency (where it is described as 'beefy red').
Importance
Distinguishing between iron-deficiency glossitis and the beefy-red glossitis of pernicious anemia helps identify the type of anemia in clinical scenarios.
Term
Petechiae
Definition
Pinpoint (less than 2 mm), flat, non-blanching red or purple spots on the skin caused by micro-hemorrhages due to thrombocytopenia or capillary fragility.
Importance
Presence of petechiae in a patient with anemia strongly suggests aplastic anemia or another condition causing thrombocytopenia — a clinical emergency requiring prompt action.
Term
Pica
Definition
A craving for non-nutritive substances (ice, clay, starch, dirt); pagophagia (ice craving) is most common in iron-deficiency anemia.
Importance
Pica is a behavioral sign of iron deficiency that nurses must recognize, particularly when taking dietary history.
Section Title
Hematologic Assessment: History and Physical Examination
Common Mistakes
- Assessing pallor only on the face in Filipino patients — always check conjunctiva and nail beds for accurate assessment regardless of skin tone.
- Attributing neurologic signs (paresthesias, ataxia) to iron deficiency — these are signs of B12 deficiency ONLY; iron deficiency does NOT cause neurologic damage.
- Missing the significance of a flow murmur in anemia — this is a COMPENSATORY cardiac response, not a primary cardiac problem.
- Confusing petechiae with purpura — petechiae are tiny (pin-point), purpura are larger, but both are non-blanching and suggest bleeding disorders.
Formulas
Example
If Hgb is 10 g/dL, expected Hct ≈ 30%. If the lab reports Hct as 20%, this warrants verification.
Formula
Hematocrit ≈ 3 × Hemoglobin
Variables
Hct = hematocrit (%); Hgb = hemoglobin (g/dL)
Application
Used as a quick cross-check when reviewing CBC results; helps identify reporting errors.
Example
WBC 2,000/µL with 20% neutrophils and 5% bands: ANC = 2,000 × (20+5)/100 = 2,000 × 0.25 = 500/µL. This is the threshold for severe neutropenia.
Formula
ANC = WBC × (% neutrophils + % bands) / 100
Variables
ANC = absolute neutrophil count; WBC = total white blood cell count per µL
Application
Used to determine infection risk in neutropenic patients (e.g., aplastic anemia, post-chemotherapy).
Exam Tips
- MEMORIZE the critical CBC normals: Hgb Male 13–18, Female 12–16; WBC 5,000–10,000; Platelets 150,000–400,000; MCV 80–100 fL.
- The MCV is your KEY to anemia classification on the NLE: Small cells (microcytic, <80) = iron deficiency; Big cells (macrocytic, >100) = B12 or folate; Normal cells (normocytic, 80–100) = aplastic or acute blood loss.
- If an NLE question asks about a patient's risk for infection, calculate or estimate ANC — platelets tell you bleeding risk, ANC tells you infection risk.
- Low reticulocytes = marrow problem or no raw materials (nutritional deficiency). High reticulocytes = marrow is working overtime (hemolysis or blood loss).
Key Points
- The CBC is the cornerstone diagnostic test for all hematologic conditions and is heavily tested on the NLE.
- Normal Hgb: MALE 13–18 g/dL; FEMALE 12–16 g/dL. Below these values = anemia.
- Normal Hct: Male 42–52%; Female 37–47%. Rule of thumb: Hct is approximately 3× the Hgb value.
- Normal WBC: 5,000–10,000/µL. Below 5,000 = leukopenia; above 10,000 = leukocytosis.
- Normal Platelets: 150,000–400,000/µL. Below 150,000 = thrombocytopenia; below 20,000 = critical bleeding risk.
- Normal MCV: 80–100 fL. MCV classifies anemia: Microcytic (<80), Normocytic (80–100), Macrocytic (>100).
- Normal Reticulocytes: 0.5–2%. Elevated reticulocytes = active marrow response (blood loss/hemolysis). Low reticulocytes = marrow failure or nutritional deficiency.
- A 'left shift' in WBC differential (increased band neutrophils) signals acute bacterial infection.
- Absolute Neutrophil Count (ANC) < 500/µL = severe neutropenia; highest risk for life-threatening infection.
- Peripheral blood smear reveals cell morphology: hypochromic microcytes (iron deficiency), hypersegmented neutrophils (B12/folate deficiency), sickle cells (sickle cell disease).
Definitions
Term
Mean Corpuscular Volume (MCV)
Definition
A CBC index measuring the average size (volume) of a single red blood cell in femtoliters (fL). Normal: 80–100 fL.
Importance
MCV is the most important CBC index for classifying the type of anemia: microcytic, normocytic, or macrocytic — each points to a different cause and treatment.
Term
Reticulocyte Count
Definition
The percentage of immature RBCs (reticulocytes) in circulating blood. Normal: 0.5–2%. Elevated = active bone marrow response; Low = marrow failure or inadequate nutrients for production.
Importance
Reticulocyte count distinguishes between anemias with active bone marrow response (hemolysis, blood loss — high retics) versus those with impaired production (aplastic anemia, nutritional deficiency — low retics).
Term
Pancytopenia
Definition
A simultaneous reduction in all three blood cell lines: RBCs (anemia), WBCs (leukopenia), and platelets (thrombocytopenia); indicates bone marrow failure.
Importance
Pancytopenia is the hallmark finding of aplastic anemia and is a critical NLE concept — the nurse must address risks from all three deficiencies simultaneously.
Term
Left Shift
Definition
An increase in immature neutrophils (band cells) in the WBC differential; indicates the marrow is releasing immature cells in response to acute severe bacterial infection.
Importance
Recognizing a left shift alerts the nurse to the likelihood of serious bacterial infection requiring prompt antibiotic therapy.
Section Title
Interpreting the Complete Blood Count (CBC)
Common Mistakes
- Memorizing only one normal Hgb value — remember there are DIFFERENT normals for males (13–18) and females (12–16).
- Confusing MCV with MCH — MCV measures SIZE (microcytic/normocytic/macrocytic); MCH measures COLOR/hemoglobin content (normochromic/hypochromic). Both are useful but MCV is more commonly tested.
- Thinking a high reticulocyte count always means the patient is getting better — high retics mean the marrow is RESPONDING to increased demand (blood loss or hemolysis), not necessarily that the condition is resolving.
- Forgetting that normal platelet count is 150,000–400,000/µL — some students incorrectly state 150–400 (without the thousands).
Exam Tips
- NLE memory aid for blood type antibodies: 'You have antibodies AGAINST what you DON'T have.' Type A lacks B antigen → has anti-B. Type O lacks both → has anti-A AND anti-B.
- Emergency transfusion without crossmatch → always use O-NEGATIVE packed RBCs.
- For NLE questions about Rh and pregnancy: Rh-NEGATIVE mother carrying Rh-POSITIVE baby → risk of HDN in subsequent pregnancies → give RhoGAM (anti-D immunoglobulin) within 72 hours after first exposure.
- A positive DIRECT Coombs = immune-mediated hemolytic anemia. Remember: 'D for Direct = Destruction of own cells.'
Key Points
- ABO blood typing is based on antigens present on the RBC surface and the corresponding antibodies in the plasma.
- Type A: has A antigen, anti-B antibodies; can receive from A and O.
- Type B: has B antigen, anti-A antibodies; can receive from B and O.
- Type AB: has both A and B antigens, NO antibodies; can receive from A, B, AB, and O — UNIVERSAL RECIPIENT.
- Type O: has NO antigens, has both anti-A and anti-B antibodies; can only receive from O — UNIVERSAL DONOR (especially O-negative).
- Type O-NEGATIVE is the universal donor for RBC transfusions because it lacks A, B, AND Rh(D) antigens — safe for emergency use before crossmatch.
- Type AB-POSITIVE is the universal recipient for whole blood and packed RBCs.
- The Rh factor: Rh-negative individuals do NOT have anti-D antibodies naturally; they form them only after exposure to Rh-positive blood (sensitization). Critical in pregnancy (hemolytic disease of the newborn — HDN).
- Before elective transfusion: TYPE AND CROSSMATCH is performed to confirm ABO/Rh compatibility.
- The Coombs (Antiglobulin) Test: Direct Coombs detects antibodies already attached to patient's own RBCs (immune hemolytic anemia); Indirect Coombs detects antibodies in patient's serum (used in crossmatching and prenatal screening).
Definitions
Term
Universal Donor
Definition
Blood type O-negative; red cells have no ABO or Rh(D) antigens and therefore will not trigger ABO or Rh incompatibility reactions in any recipient.
Importance
O-negative packed RBCs are used in emergency transfusions when there is no time for type and crossmatch — a clinically critical concept for trauma and obstetric emergencies in Philippine hospitals.
Term
Universal Recipient
Definition
Blood type AB-positive; the recipient has no ABO antibodies (cannot react against A or B antigens) and is Rh-positive (will not react to Rh+ blood).
Importance
AB-positive individuals can receive blood from any ABO/Rh type without ABO or Rh-related hemolytic reactions.
Term
Type and Crossmatch
Definition
A pre-transfusion laboratory procedure that first determines the patient's ABO and Rh type, then physically mixes the patient's serum with donor RBCs to confirm compatibility and detect unexpected antibodies.
Importance
Standard of care before all elective transfusions; failure to perform this can result in acute hemolytic transfusion reactions, a potentially fatal complication.
Term
Direct Coombs Test (DAT)
Definition
Tests for antibodies or complement attached directly to the patient's circulating red blood cells; positive result indicates immune-mediated hemolysis.
Importance
A positive direct Coombs is the hallmark of autoimmune hemolytic anemia and hemolytic transfusion reactions — commonly tested in NLE scenarios involving jaundice and anemia.
Section Title
Blood Typing and Transfusion Compatibility
Common Mistakes
- Confusing universal DONOR and universal RECIPIENT — O-negative DONATES to all; AB-positive RECEIVES from all. Think: 'O gives, AB takes.'
- Stating that type O can receive from anyone — Type O can only receive from type O because they carry BOTH anti-A and anti-B antibodies.
- Forgetting the Rh component — even type O blood that is Rh-POSITIVE can cause reactions in Rh-negative recipients; the universal donor is O-NEGATIVE.
- Mixing up Direct and Indirect Coombs tests — Direct = antibodies ON patient's own RBCs (direct detection on cells); Indirect = antibodies IN patient's serum (indirect, you test the liquid part).
Exam Tips
- Memory aid for iron lab pattern: 'In iron deficiency, everything is LOW except TIBC which is HIGH.' Low ferritin, low serum iron, low Hgb, low MCV, HIGH TIBC.
- NLE questions about iron administration: empty stomach + vitamin C = best absorption; Z-track for IM; straw for liquid; warn about black stools.
- Remember: FERROUS sulfate (Fe2+) is better absorbed than FERRIC (Fe3+); vitamin C keeps iron in the ferrous state for absorption.
- In the Philippine primary care context: malnutrition screening in children (6–59 months) often includes assessment for iron-deficiency anemia as per DOH protocols.
Key Points
- The MOST COMMON anemia worldwide and the most common nutritional deficiency in the Philippines.
- Characterized by MICROCYTIC (small), HYPOCHROMIC (pale/low color) RBCs due to insufficient iron for hemoglobin synthesis.
- Most common cause in adults: CHRONIC BLOOD LOSS (GI bleeding in men and older women; heavy menstruation in reproductive-age women).
- Other causes: inadequate dietary intake (especially in malnourished Filipino infants and children), malabsorption (celiac disease, post-gastrectomy), and increased demand (pregnancy, infancy).
- Key laboratory findings: LOW Hgb/Hct, LOW MCV (<80 fL), LOW serum ferritin (BEST MARKER of iron stores), LOW serum iron, HIGH TIBC (total iron-binding capacity).
- Specific clinical signs: koilonychia, glossitis, angular cheilitis, and PICA (especially pagophagia — craving ice).
- Treatment: Oral FERROUS SULFATE 325 mg (65 mg elemental iron), 1–3 times daily.
- Administration: Take on an EMPTY STOMACH for best absorption; give with VITAMIN C (orange juice) to enhance absorption. If GI upset, may take with food (absorption slightly reduced).
- AVOID: milk, antacids, tea, coffee, and calcium supplements taken at the same time as iron — these inhibit absorption.
- Warn patients about BLACK/TARRY STOOLS (normal, harmless side effect) and constipation; liquid iron must be taken through a STRAW to prevent teeth staining.
- Parenteral iron (iron dextran, iron sucrose) for malabsorption or intolerance; IM iron given by Z-TRACK technique to prevent skin staining; give test dose for iron dextran and observe for ANAPHYLAXIS.
- ALWAYS investigate the SOURCE of blood loss — do not just treat the anemia without finding the cause, especially occult GI bleeding.
Definitions
Term
Serum Ferritin
Definition
A protein that stores iron intracellularly; serum ferritin level is the best single laboratory indicator of total body iron stores. Low ferritin = iron-deficiency anemia.
Importance
The most sensitive and specific test for iron-deficiency anemia; tested frequently on the NLE to distinguish iron deficiency from other anemias.
Term
Total Iron-Binding Capacity (TIBC)
Definition
Measures the blood's capacity to transport iron by measuring how much transferrin (the iron-transport protein) is available to bind iron. High TIBC = more unfilled transferrin binding sites = iron deficiency.
Importance
In iron-deficiency anemia: TIBC is HIGH (liver makes more transferrin trying to capture every iron molecule available) while serum iron is LOW — this inverse relationship is a classic NLE question pattern.
Term
Z-Track Technique
Definition
An intramuscular injection method where the skin is pulled 1–1.5 inches laterally before injection and held until after needle withdrawal, then released to seal the drug in the muscle tissue and prevent leakage into subcutaneous tissue.
Importance
Mandatory technique for parenteral iron administration to prevent permanent brown skin staining (tattooing) at the injection site.
Section Title
Iron-Deficiency Anemia
Common Mistakes
- Recommending iron with milk or antacids — these DECREASE iron absorption; always pair iron with vitamin C (ascorbic acid).
- Alarming the patient about black stools without explaining it is EXPECTED and HARMLESS — failure to warn leads to patient non-compliance when they see dark stools.
- Forgetting to investigate the CAUSE of iron deficiency — treating only with iron tablets without finding occult GI bleeding is incomplete nursing care.
- Administering IM iron without Z-track technique — this leads to skin tattooing and is a reportable medication error.
- Confusing iron sucrose with iron dextran — only IRON DEXTRAN requires a test dose for anaphylaxis; iron sucrose has a lower anaphylaxis risk but still requires monitoring.
Exam Tips
- NLE key distinction: BOTH B12 deficiency and folate deficiency cause macrocytic/megaloblastic anemia. But ONLY B12 deficiency causes NEUROLOGIC signs (paresthesias, ataxia). This is the most commonly tested differentiating point.
- If the question says 'pernicious anemia' → route must be IM (intramuscular) because oral B12 cannot be absorbed.
- Early treatment is critical — the more neurologic damage that occurs, the less reversible it becomes. NLE scenarios may ask about priority interventions; preventing further neurologic damage is a major goal.
- Remember: Pernicious anemia used to be called 'pernicious' because it was fatal before injectable B12 was discovered.
Key Points
- Pernicious anemia is an AUTOIMMUNE condition where the body destroys gastric parietal cells, causing LOSS OF INTRINSIC FACTOR (IF) production.
- Without intrinsic factor, vitamin B12 CANNOT be absorbed in the terminal ileum regardless of dietary intake.
- Other causes of B12 deficiency: gastrectomy (removal of parietal cells), ileal disease/resection, strict vegan diet (B12 is found only in animal products).
- B12 is needed for DNA synthesis and MYELIN SHEATH formation — deficiency impairs both RBC maturation AND neurologic function.
- Result: MACROCYTIC (large), MEGALOBLASTIC (immature, abnormal large cells) anemia.
- Key CBC findings: elevated MCV (>100 fL), HYPERSEGMENTED NEUTROPHILS (5+ lobes) on peripheral smear, low B12 level.
- UNIQUE clinical features of B12 deficiency NOT seen in folate deficiency: NEUROLOGIC SIGNS — paresthesias (numbness/tingling) of hands and feet, ataxia (unsteady gait), impaired proprioception, and if untreated, IRREVERSIBLE neurologic damage and dementia.
- Beefy red, sore, smooth glossitis is characteristic.
- The SCHILLING TEST historically confirmed pernicious anemia by measuring urinary excretion of radiolabeled oral B12 with and without added intrinsic factor — corrected absorption with IF added = confirms pernicious anemia. Now largely replaced by antibody testing (anti-intrinsic factor antibodies, anti-parietal cell antibodies).
- Treatment: LIFELONG intramuscular (IM) cyanocobalamin (vitamin B12) injections — because oral B12 cannot be absorbed without intrinsic factor.
- Loading doses: daily or weekly injections initially; then MONTHLY for life.
- CRITICAL teaching point: Treatment is LIFELONG. Stopping injections will cause relapse and potentially IRREVERSIBLE neurologic damage.
Definitions
Term
Intrinsic Factor (IF)
Definition
A glycoprotein produced by parietal cells of the gastric mucosa; binds vitamin B12 in the stomach and carries it to the terminal ileum where the B12-IF complex is absorbed.
Importance
The absolute REQUIREMENT for IF in B12 absorption makes pernicious anemia a condition that cannot be corrected by diet alone — the route of administration (IM injection) is determined by this defect.
Term
Megaloblastic Anemia
Definition
A type of macrocytic anemia characterized by abnormally large, immature RBC precursors (megaloblasts) in the bone marrow due to impaired DNA synthesis caused by B12 or folate deficiency.
Importance
Megaloblastic anemia encompasses both B12 and folate deficiency anemia; the KEY distinguishing feature is that only B12 deficiency causes neurologic symptoms.
Term
Schilling Test
Definition
A diagnostic test using radiolabeled oral vitamin B12 to determine whether B12 malabsorption is due to intrinsic factor deficiency (pernicious anemia) or other causes. Now replaced by anti-IF and anti-parietal cell antibody testing.
Importance
Still appears in NLE questions as a classic diagnostic test for pernicious anemia; know the principle: absorption improves when IF is added in pernicious anemia.
Section Title
Pernicious Anemia and Vitamin B12 Deficiency
Common Mistakes
- Saying folate deficiency causes neurologic problems — FOLATE DEFICIENCY DOES NOT CAUSE NEUROLOGIC SIGNS. Only B12 deficiency causes paresthesias, ataxia, and dementia.
- Assuming oral B12 supplements will work in pernicious anemia — because the defect is ABSENT intrinsic factor (absorption problem), not dietary insufficiency; treatment must be PARENTERAL (IM).
- Forgetting that treatment is LIFELONG — students often say 'continue until B12 levels normalize'; this is wrong because the underlying autoimmune defect cannot be corrected.
- Confusing macrocytic anemia with sickle cell anemia — sickle cell produces NORMOCYTIC, not macrocytic, anemia.
Exam Tips
- NLE priority intervention for aplastic anemia with ANC < 500/µL: INFECTION PREVENTION is the priority using Maslow's Physiological and Safety hierarchy — infection can be rapidly fatal.
- Bleeding precautions for thrombocytopenia: soft-bristle toothbrush, electric razor, NO IM injections (use subcutaneous or IV routes), NO rectal temperature or suppositories, apply prolonged pressure to venipuncture sites.
- If a question asks about the CAUSE of aplastic anemia and lists chloramphenicol — this is correct; it is the most commonly tested drug-induced aplastic anemia example.
- The key difference between aplastic anemia and leukemia on a CBC: both can show low counts, but leukemia shows BLASTS (immature malignant cells) on smear, while aplastic anemia shows a hypocellular marrow with no abnormal cells.
Key Points
- Aplastic anemia is BONE MARROW FAILURE causing suppression of ALL blood cell lines (erythroid, myeloid, megakaryocyte series).
- Result: PANCYTOPENIA — simultaneous anemia, leukopenia, and thrombocytopenia.
- RBC morphology: NORMOCYTIC, NORMOCHROMIC (cells are normal size and color — the problem is that too FEW are being made, not abnormal cells).
- Common causes: IDIOPATHIC (most common — possibly autoimmune T-cell mediated destruction of stem cells), drugs/chemicals (chloramphenicol — a key NLE drug, benzene, chemotherapy), radiation, viral infections (EBV, hepatitis), autoimmune disorders.
- Chloramphenicol is the classic drug associated with aplastic anemia — important in the Philippine context as it is used in typhoid fever treatment.
- TRIPLE THREAT of manifestations (all from pancytopenia): 1) Anemia (fatigue, pallor, dyspnea); 2) Leukopenia (recurrent infections, fever); 3) Thrombocytopenia (petechiae, bleeding, ecchymoses).
- Diagnosis: CBC showing pancytopenia + BONE MARROW BIOPSY showing HYPOCELLULAR (fatty, empty) marrow.
- Management: (1) REMOVE the causative agent; (2) Supportive TRANSFUSIONS (packed RBCs for anemia, platelets for bleeding); (3) IMMUNOSUPPRESSIVE therapy (anti-thymocyte globulin/ATG + cyclosporine); (4) HEMATOPOIETIC STEM CELL TRANSPLANT (HSCT/bone marrow transplant) — the only curative treatment for eligible patients.
- Nursing priority: INFECTION PREVENTION (protective/reverse isolation, hand hygiene, monitor ANC and temperature) and BLEEDING PRECAUTIONS.
Definitions
Term
Pancytopenia
Definition
Reduction of all three blood cell lines (RBCs, WBCs, and platelets) simultaneously due to bone marrow failure.
Importance
The defining laboratory finding of aplastic anemia; recognizing pancytopenia in a CBC leads the nurse to suspect bone marrow pathology and prioritize all three protective interventions (oxygen, infection control, bleeding precautions).
Term
Hypocellular Bone Marrow
Definition
A bone marrow biopsy finding showing replacement of normal hematopoietic tissue with fat cells, indicating severely reduced or absent blood cell production.
Importance
The definitive diagnostic finding for aplastic anemia; a normal-looking biopsy rules out aplastic anemia.
Term
Hematopoietic Stem Cell Transplant (HSCT)
Definition
A procedure that replaces diseased or nonfunctional bone marrow with healthy donor stem cells capable of regenerating all blood cell lines; the only potentially curative treatment for aplastic anemia.
Importance
NLE questions may ask about the curative treatment for aplastic anemia — the answer is HSCT (bone marrow transplant), not immunosuppression alone.
Section Title
Aplastic Anemia
Common Mistakes
- Describing aplastic anemia cells as microcytic or macrocytic — aplastic anemia cells are NORMOCYTIC because the marrow is making fewer but morphologically NORMAL cells.
- Thinking only the anemia component requires management — ALWAYS address all three: anemia (transfuse), leukopenia (infection precautions), AND thrombocytopenia (bleeding precautions).
- Forgetting chloramphenicol as a causative drug — in the Philippine context, this is highly relevant because chloramphenicol is on the Philippine National Drug Formulary for typhoid fever.
- Confusing protective isolation (for the neutropenic patient) with contact isolation (for infectious patients) — in aplastic anemia, isolation protects the PATIENT from environmental pathogens, not the other way around.
Exam Tips
- Classic NLE scenario for hemolytic anemia: 'Patient has anemia WITH jaundice AND splenomegaly AND dark urine' = hemolytic anemia. The jaundice key differentiates it from other anemias.
- Sickle cell crisis priority interventions in order: (1) Hydration, (2) Oxygen, (3) Pain management (IV opioids), (4) Treat infection. Remember: 'HOPE' — Hydration, Oxygen, Pain control, Eradicate infection.
- Pre-splenectomy vaccines must be given BEFORE surgery — Pneumococcal, Meningococcal, and H. influenzae type B vaccines, because the spleen normally filters encapsulated bacteria.
- Folic acid supplementation in hemolytic anemia is important because rapid RBC turnover consumes large amounts of folate for DNA synthesis in the marrow.
Key Points
- Hemolytic anemia is caused by PREMATURE DESTRUCTION (hemolysis) of RBCs faster than the bone marrow can replace them.
- Causes: INHERITED (sickle cell disease, thalassemia, G6PD deficiency, hereditary spherocytosis) or ACQUIRED (autoimmune, transfusion reactions, drugs, mechanical heart valves).
- Key signs of hemolysis: JAUNDICE (elevated indirect/unconjugated bilirubin from Hgb breakdown), DARK URINE (hemoglobinuria), SPLENOMEGALY (spleen overworked filtering destroyed cells), elevated LDH, LOW HAPTOGLOBIN.
- HIGH RETICULOCYTE COUNT (marrow is compensating by releasing immature cells rapidly).
- POSITIVE DIRECT COOMBS TEST confirms immune-mediated (autoimmune) hemolysis.
- SICKLE CELL DISEASE: inherited autosomal recessive hemoglobinopathy; abnormal hemoglobin S (HbS) causes RBCs to SICKLE (become crescent-shaped) under deoxygenated conditions.
- Sickling triggers: HYPOXIA, DEHYDRATION, INFECTION, ACIDOSIS, COLD TEMPERATURES, physical stress.
- VASO-OCCLUSIVE CRISIS (most common type): sickled cells obstruct small blood vessels → severe bone pain (often in arms, legs, back, chest), organ infarction.
- Management of sickle cell crisis: HYDRATION (IV fluids to prevent sickling), OXYGEN (to relieve hypoxia), PAIN CONTROL (IV opioids — morphine is first-line), TREAT INFECTION (precipitating factor), BED REST and warmth.
- HYDROXYUREA: the primary disease-modifying drug for sickle cell; increases fetal hemoglobin (HbF) production, which does not sickle, reducing crisis frequency.
- General management of hemolytic anemia: treat the cause, FOLIC ACID supplementation (high marrow turnover increases folate demand), transfusions as needed, SPLENECTOMY in some cases (with pre-splenectomy vaccination against Streptococcus pneumoniae, H. influenzae, N. meningitidis).
- Long-term complications of sickle cell disease: cholelithiasis (pigment gallstones), aplastic crisis (triggered by parvovirus B19), chronic organ damage (kidneys, eyes, lungs), and with chronic transfusion therapy — iron overload.
Definitions
Term
Vaso-Occlusive Crisis
Definition
The most common acute complication of sickle cell disease, caused by sickled RBCs blocking microcirculation, resulting in ischemia and severe pain in affected bones and organs.
Importance
The primary reason for hospital admission in sickle cell patients; nursing management centers on pain relief, hydration, and oxygenation — all high-priority NLE interventions.
Term
Hydroxyurea
Definition
An oral chemotherapy drug used in sickle cell disease that stimulates fetal hemoglobin (HbF) production; HbF inhibits sickling of HbS, reducing the frequency and severity of vaso-occlusive crises.
Importance
The most important preventive medication for sickle cell disease; NLE questions may ask about its mechanism (increases HbF) and main indication (preventing sickle cell crises).
Term
Haptoglobin
Definition
A plasma protein that binds free hemoglobin released from lysed RBCs; in hemolytic anemia, haptoglobin levels are LOW because it is rapidly consumed binding the excess free Hgb.
Importance
Low haptoglobin is a confirmatory lab finding for intravascular hemolysis, complementing elevated indirect bilirubin and elevated LDH.
Term
G6PD Deficiency
Definition
An X-linked recessive inherited enzyme deficiency (glucose-6-phosphate dehydrogenase) that makes RBCs vulnerable to oxidative stress from certain drugs (primaquine, dapsone, sulfonamides), infections, or fava beans, triggering episodic hemolytic anemia.
Importance
Common in the Philippine population; nurses must recognize that hemolysis in G6PD deficiency is triggered by SPECIFIC DRUGS and foods — avoidance is the main management.
Section Title
Hemolytic Anemia and Sickle Cell Disease
Common Mistakes
- Saying hemolytic anemia shows low reticulocytes — hemolytic anemia shows HIGH reticulocytes because the marrow is actively responding. Low retics = marrow failure (aplastic anemia).
- Forgetting to give OXYGEN in sickle cell crisis — hypoxia perpetuates sickling; oxygen is a critical nursing intervention along with hydration.
- Overlooking HYDRATION as a priority in sickle cell crisis — IV fluids reduce blood viscosity and help unsickle cells by improving oxygenation. Ask Filipino patients about fluid intake habits, especially during hot weather.
- Confusing hemolytic jaundice (indirect/unconjugated bilirubin elevated) with obstructive jaundice (direct/conjugated bilirubin elevated) — in hemolysis, the liver has NOT conjugated the excess bilirubin yet, so INDIRECT bilirubin is elevated.
Exam Tips
- Maslow prioritization on NLE: Physiological needs first (oxygen/gas exchange), then Safety (infection/bleeding), then Psychological needs (fear, knowledge deficit). Apply this when choosing 'priority nursing action' in multiple-choice questions.
- When an NLE question asks the FIRST nursing action when a transfusion reaction is suspected: STOP the transfusion IMMEDIATELY, then maintain IV access with normal saline, notify the physician, and monitor vital signs.
- Dietary teaching for Filipino patients: recommend locally available iron-rich foods like malunggay (moringa), kangkong (water spinach), liver, and legumes; for B12, emphasize animal products; for folate, recommend vegetables and fortified rice.
- RA 9173 reference: Section 28 outlines the scope of nursing practice including health teaching and administration of medications — nurses have both a legal and professional responsibility for all the teaching points above.
Key Points
- Apply the NURSING PROCESS systematically; use NANDA-approved nursing diagnoses prioritized by Maslow's Hierarchy.
- Priority NANDA nursing diagnoses in anemia: (1) Activity Intolerance r/t tissue hypoxia AEB fatigue and dyspnea on exertion; (2) Impaired Gas Exchange r/t decreased oxygen-carrying capacity; (3) Risk for Infection (aplastic anemia/neutropenia); (4) Risk for Bleeding/Ineffective Protection (thrombocytopenia); (5) Imbalanced Nutrition: Less than Body Requirements (iron/B12/folate deficiency).
- ACTIVITY MANAGEMENT: Balance activity with rest; cluster nursing care to conserve patient energy; encourage gradual increase in activity as tolerated; assess and document activity tolerance.
- OXYGEN THERAPY: Administer supplemental oxygen for symptomatic hypoxia (SpO2 <90% or severe dyspnea); monitor continuously in severe anemia.
- INFECTION PRECAUTIONS for neutropenic patients (ANC <500): Protective (reverse) isolation, strict hand hygiene by all staff and visitors, restrict visitors with active infections, monitor temperature q4h (fever >38°C is a medical emergency in neutropenia), avoid live plants and fresh flowers (harbor mold/bacteria).
- BLEEDING PRECAUTIONS for thrombocytopenic patients: Soft-bristle toothbrush, electric razor for shaving, avoid IM injections and rectal temperatures/suppositories, minimize venipunctures, apply prolonged pressure (5–10 min) to all puncture sites, pad side rails for fall prevention.
- MEDICATION ADMINISTRATION: Administer prescribed hematinics (iron, B12, folate), growth factors (EPO, G-CSF), or transfusions per physician orders and monitor response.
- DIETARY TEACHING: Iron sources (red meat, organ meats, dark leafy vegetables like kangkong/malunggay, legumes, fortified cereals); B12 sources (animal products: meat, fish, eggs, dairy); folate sources (green leafy vegetables, citrus, legumes, fortified grains).
- TRANSFUSION MONITORING: Monitor vital signs before, 15 minutes after start, and every hour during transfusion; stop immediately and notify physician if fever, chills, back pain, flushing, or hypotension (signs of hemolytic transfusion reaction).
- Under RA 9173, nurses are legally and professionally responsible for safe medication administration, accurate assessment, and patient education — all critical competencies in hematologic nursing.
Definitions
Term
Activity Intolerance
Definition
A NANDA nursing diagnosis defined as insufficient physiologic or psychological energy to endure or complete required or desired daily activities; caused by tissue hypoxia from anemia.
Importance
The most common nursing diagnosis applicable to all types of anemia; interventions center on energy conservation, planned rest periods, and gradual activity progression.
Term
Protective (Reverse) Isolation
Definition
Infection control measures designed to protect an immunocompromised patient (with neutropenia) from environmental pathogens rather than protecting others from the patient.
Importance
Standard nursing practice for patients with ANC <500/µL (severe neutropenia from aplastic anemia or chemotherapy); nurses must distinguish this from standard contact/droplet/airborne isolation.
Section Title
Nursing Management: Priority Interventions and Patient Teaching
Common Mistakes
- Prioritizing comfort over safety in neutropenic patients — fever in a neutropenic patient is a MEDICAL EMERGENCY requiring immediate blood cultures and IV antibiotics, not just comfort measures.
- Taking rectal temperature in thrombocytopenic patients — rectal manipulation can cause rectal bleeding; use axillary or tympanic route instead.
- Giving IM injections without considering platelet count — below 50,000/µL, IM injections pose significant hematoma risk; use IV or oral routes whenever possible.
- Forgetting to teach patients about food-drug interactions for iron supplements — specifically that iron must NOT be taken with calcium (milk), antacids, or tannins (tea, coffee).
Connections
- Iron-deficiency anemia is directly connected to the obstetric nursing topic of anemia in pregnancy (common in Filipino mothers) — screening and iron supplementation are part of prenatal care protocols under PhilHealth and DOH maternal care programs.
- Pernicious anemia connects to gastrointestinal nursing: gastrectomy patients permanently lose intrinsic factor production and will require lifelong B12 injections — a critical post-operative teaching point in NCM 103.
- Aplastic anemia relates to oncology nursing since chemotherapy is a major cause; post-chemotherapy bone marrow suppression follows the same pancytopenia management principles (infection precautions, bleeding precautions, transfusion support).
- Sickle cell disease connects to genetic and community health nursing — autosomal recessive inheritance patterns, pre-marital genetic counseling, and newborn screening (Republic Act 9288 — Philippine Newborn Screening Act includes hemoglobinopathies).
- Blood typing and transfusion compatibility connects directly to operating room and emergency nursing practice — nurses must verify blood product compatibility before administration per DOH Blood Service Facilities guidelines.
- Hemolytic anemia in neonates (hemolytic disease of the newborn — HDN) connects to maternal-child nursing (Rh incompatibility, ABO incompatibility, RhoGAM administration).
- The CBC interpretation skills in this chapter are foundational for ALL medical-surgical nursing topics including infections (WBC), cardiac surgery (Hgb/Hct for surgical risk), and renal failure (anemia of chronic kidney disease from low EPO).
- Nutritional assessment connects to community health nursing (public health): iron-deficiency anemia is among the most prevalent nutritional deficiency diseases in the Philippines, addressed by the Food and Nutrition Research Institute (FNRI) and DOH through iron supplementation programs for children and pregnant women.
- G6PD deficiency is included in the Philippine Newborn Screening Program (RA 9288) — nurses play a key role in collecting screening specimens and counseling families about G6PD trigger avoidance (primaquine used for malaria in endemic Philippine regions).
- The nursing diagnoses for anemia (Activity Intolerance, Impaired Gas Exchange) are the same priority diagnoses used in cardiac nursing and respiratory nursing — demonstrating the cross-system applicability of NCM principles.
Exam Strategy
For NLE questions on hematologic nursing, use a systematic THREE-STEP approach: STEP 1 — IDENTIFY the anemia type from the CBC clue words: 'microcytic/hypochromic + low ferritin/high TIBC' = Iron Deficiency; 'macrocytic/megaloblastic + neurologic signs' = B12 deficiency (pernicious anemia); 'macrocytic/megaloblastic WITHOUT neurologic signs' = Folate deficiency; 'normocytic + pancytopenia + hypocellular marrow' = Aplastic anemia; 'normocytic + jaundice + splenomegaly + high reticulocytes + dark urine' = Hemolytic anemia. STEP 2 — MATCH the cause to the treatment: Iron deficiency → ferrous sulfate + vitamin C on empty stomach; Pernicious anemia → lifelong IM B12; Aplastic anemia → remove cause + immunosuppression + HSCT; Sickle cell crisis → HOPE (Hydration, Oxygen, Pain control, Eradicate infection). STEP 3 — PRIORITIZE nursing actions using MASLOW: Airway/Breathing (oxygen for hypoxia) before Safety (infection/bleeding precautions) before Teaching (dietary, medication adherence). For ABO compatibility questions, use the rule: 'You carry antibodies AGAINST antigens you DON'T have.' For emergency transfusions without crossmatch: ALWAYS O-negative. On the Philippine NLE, watch for clinical scenario questions that describe combinations of findings — piece together the clinical picture before choosing an answer. Do NOT rush on CBC interpretation questions; eliminate wrong answers by checking MCV first, then look for the unique distinguishing sign (neurologic for B12, jaundice for hemolytic, pancytopenia for aplastic). Aim to memorize ALL normal CBC values in the High-Yield table — these appear repeatedly as the basis for data interpretation questions.
Quick Review Questions
A Filipino patient is found to have an Hgb of 9 g/dL, MCV of 68 fL, serum ferritin of 5 ng/mL (low), and TIBC of 450 µg/dL (high). Which type of anemia does this CBC pattern represent?
The pattern of low Hgb with a LOW MCV (<80 fL = microcytic), low serum ferritin (depleted iron stores — the best marker), and HIGH TIBC (the body is making more transferrin to grab every available iron molecule) is the classic laboratory signature of iron-deficiency anemia. The cells are small (microcytic) and pale (hypochromic) because there is insufficient iron to make hemoglobin.
A patient with pernicious anemia is prescribed vitamin B12 replacement. The patient asks: 'Can I just take B12 tablets from the drugstore since it is cheaper?' What is the most appropriate nursing response?
The fundamental defect in pernicious anemia is the autoimmune destruction of gastric parietal cells, which produce intrinsic factor (IF). Without IF, vitamin B12 cannot bind and be transported across the ileal mucosa regardless of how much is taken orally. Therefore, the only effective route is parenteral (IM). Emphasize to the patient that this treatment is LIFELONG, and stopping injections risks return of anemia AND irreversible neurologic damage.
A patient with aplastic anemia has a temperature of 38.6°C and an ANC of 320/µL. What is the nurse's PRIORITY action?
In aplastic anemia with severe neutropenia (ANC <500/µL), the immune system is critically compromised and unable to fight infection. Fever (>38°C) signals potential sepsis, which can be rapidly fatal without immediate treatment. Using Maslow's hierarchy, safety from life-threatening infection takes priority. The nurse should notify the physician immediately, obtain blood cultures before starting antibiotics (to identify the organism), and administer prescribed broad-spectrum IV antibiotics without delay.
Which blood type is considered the UNIVERSAL DONOR for packed red blood cell transfusions, and why?
Type O-negative RBCs have NO ABO antigens (no A, no B) AND no Rh(D) antigen on their surface. Because there are no antigens to trigger an antibody response, O-negative blood can be transfused to a recipient of ANY blood type without causing an ABO or Rh incompatibility reaction. This is why O-negative packed RBCs are stored in emergency departments and trauma units for immediate use before type and crossmatch results are available.
A patient in sickle cell vaso-occlusive crisis is admitted to the ward. List the four priority nursing interventions in order.
The vaso-occlusive crisis is caused by dehydration and hypoxia causing sickling of HbS. Hydration reverses hemoconcentration and reduces sickling. Oxygen relieves the hypoxia that perpetuates sickling. IV opioids (morphine) are the drug of choice for severe sickle cell pain. If infection triggered the crisis, antibiotics are started. Memory aid: 'HOPE' — Hydration, Oxygen, Pain control, Eradicate infection.
What is the key laboratory finding that DIFFERENTIATES vitamin B12 deficiency anemia from folate deficiency anemia, since both cause macrocytic/megaloblastic anemia?
Both B12 and folate deficiency cause macrocytic megaloblastic anemia with hypersegmented neutrophils on peripheral smear. However, B12 is uniquely required for myelin sheath synthesis in the nervous system. Deficiency causes demyelination, producing neurologic symptoms: paresthesias (tingling/numbness of hands and feet), ataxia (unsteady gait), impaired vibration sense and proprioception, and eventually dementia. Folate deficiency has NONE of these neurologic features. This distinction is the most commonly tested differentiating point in NLE questions about macrocytic anemia.
A nurse is preparing to give an IM injection of iron dextran. What technique must be used, and why?
The Z-track technique displaces the subcutaneous tissue away from the muscle during injection. When the needle is withdrawn and the skin is released, the zigzag tissue layers seal the drug pathway, preventing iron from leaking upward into the subcutaneous tissue and skin. Iron is a highly irritating substance that causes permanent brown skin discoloration (tattooing) if it leaks into the dermis. Additionally, a test dose of iron dextran should be given first and the patient observed for at least 30–60 minutes for anaphylaxis (the most serious adverse reaction to iron dextran).
A CBC result shows: Hgb 8 g/dL, WBC 2,200/µL, Platelets 45,000/µL, MCV 88 fL. What is the likely diagnosis and what bone marrow finding would confirm it?
The CBC shows PANCYTOPENIA: low Hgb (anemia), very low WBC (leukopenia), and very low platelets (thrombocytopenia). The MCV is 88 fL = normocytic, which is characteristic of aplastic anemia (the marrow makes fewer but morphologically normal cells). A hypocellular bone marrow on biopsy — showing replacement of normal blood-cell-producing tissue with fat cells — is the definitive diagnostic finding. The normocytic morphology distinguishes aplastic anemia from iron deficiency (microcytic) and B12/folate deficiency (macrocytic).
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