Guide — Hematology
Anemia Nursing Care
Anemia is not a diagnosis — it is a finding with a cause, and the cause decides everything: the labs, the treatment, the teaching, and the urgency. This guide organizes the major types around the question that sorts them: is the body losing red cells, destroying them, or failing to make them?
8 min read · Hematology
Educational use only. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Overview
Every anemia comes from one of three mechanisms: blood loss (acute or slow GI ooze), decreased production (missing ingredients like iron or B12, or marrow failure), and increased destruction (hemolysis). The history and two lab values — MCV (cell size) and reticulocyte count (marrow effort) — point to the mechanism before any specialist gets involved.
Small cells (microcytic) usually mean iron problems. Large cells (macrocytic) mean B12 or folate. Normal-size cells with a low reticulocyte count mean the marrow is underproducing (chronic disease, marrow failure); normal-size cells with a high reticulocyte count mean the marrow is compensating for loss or destruction.
Key Concepts by Type
Iron-deficiency anemia — microcytic, low ferritin
The most common anemia worldwide. In adults, it is a bleeding question until proven otherwise — menstrual loss, GI loss, malignancy screening in older adults. Oral iron is the usual treatment; absorption improves on an empty stomach with vitamin C, and it reliably causes GI upset, constipation, and dark stools.
B12 deficiency — macrocytic with neuro findings
The differentiator from folate deficiency is neurologic involvement: paresthesias, balance and proprioception problems, cognitive changes. Pernicious anemia (loss of intrinsic factor) cannot be fixed with oral diet alone — patients need parenteral or high-dose B12 for life. Untreated, the neuro damage becomes permanent.
Folate deficiency — macrocytic without neuro findings
Seen with poor intake, alcohol use disorder, and increased demand (pregnancy). Critical in the first trimester — folate deficiency drives neural tube defects, which is why supplementation starts before conception.
Aplastic anemia — pancytopenia
Marrow failure takes out all three cell lines: anemia (fatigue), neutropenia (infection), thrombocytopenia (bleeding). The nursing posture is protective — infection precautions and bleeding precautions simultaneously — while the cause is worked up.
Hemolytic anemia — destruction
Jaundice, dark urine, high reticulocytes, high LDH and indirect bilirubin, low haptoglobin. Causes range from autoimmune to drug-induced to mechanical (prosthetic valves) to sickle cell. The marker pattern is the tell: the marrow is working hard while cells die early.
Anemia of chronic disease — inflammation hoards iron
Chronic inflammation (CKD, autoimmune disease, malignancy) locks iron away and blunts marrow response. Ferritin is normal or high — giving iron does not fix it; treating the underlying disease (and erythropoietin agents in CKD) does.
Assessment Findings
The shared picture is oxygen-delivery failure scaled to severity and speed: fatigue, exertional dyspnea, pallor (conjunctivae, palmar creases, mucosa — more reliable than skin tone), tachycardia, and orthostatic symptoms. Slow anemias compensate impressively — a hemoglobin of 7 g/dL that developed over months may walk and talk; the same number from acute bleeding is an emergency.
Type-specific clues: spoon nails, pica, and cold sensitivity (iron deficiency); a smooth sore tongue and paresthesias (B12); jaundice and dark urine (hemolysis); petechiae and fevers alongside fatigue (aplastic). In older adults, anemia often presents as falls, confusion, or worsening heart failure rather than reported fatigue.
Nursing Priorities
Match activity to oxygen supply. Cluster care, schedule rest, and progress activity with vitals — symptomatic anemia plus pushed activity equals syncope and falls. Energy conservation is an intervention, not a suggestion.
Find the blood if it is leaving. For unexplained iron deficiency: stool occult blood, menstrual history, NSAID use, anticoagulants. The anemia is treatable; the missed GI malignancy is the catastrophe.
Know the transfusion threshold conversation. Restrictive thresholds (commonly Hgb around 7 g/dL in stable patients, higher with cardiac disease or active ischemia) are provider decisions — your role is trending, symptoms, and advocating when the patient is symptomatic at any number.
Therapeutic Communication Considerations
Fatigue is invisible, and patients minimize it — especially older adults who assume it is age and women who have normalized heavy periods for years. Ask in functional terms: “What could you do six months ago that is hard now?” The answer often makes the case for workup better than any number.
For lifelong treatments (pernicious anemia, CKD anemia), frame adherence around the mechanism: “Your stomach can no longer absorb B12 from food — the injections replace what eating can’t.” Patients abandon treatments they think are temporary fixes; they keep treatments they understand as replacements.
Patient Education
• Oral iron: take with vitamin C, away from dairy/antacids/coffee; expect dark stools; manage constipation proactively; keep away from children — iron overdose is a pediatric emergency
• B12 injections or high-dose therapy are for life in pernicious anemia — symptoms returning after stopping is the expected consequence
• Folate-rich foods: leafy greens, legumes, fortified grains; iron-rich: meats, beans, fortified cereals (pair plant iron with vitamin C)
• Report black tarry stools that are not explainable by iron, blood in stool or urine, or new bleeding — anemia plus bleeding is never “wait and see”
• Rise slowly; plan rest into the day while counts recover
NCLEX Pearls
• MCV sorts the question: microcytic → iron; macrocytic → B12/folate; the neuro symptoms belong to B12, not folate.
• Pernicious anemia = intrinsic factor problem = parenteral B12 for life; “eat more B12” is a wrong answer.
• Oral iron: empty stomach + orange juice is the classic right answer; with milk or antacids is the classic wrong one.
• Ferritin separates iron deficiency (low) from anemia of chronic disease (normal/high).
• Aplastic anemia questions are really infection + bleeding precaution questions.
• Hemolysis pattern: ↑retic, ↑LDH, ↑indirect bilirubin, ↓haptoglobin, possible dark urine.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with AABB (transfusion standards) · American Society of Hematology (ASH). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →