multi class comparison
Anemia Types: Iron Deficiency vs B12/Folate vs Sickle Cell — MCV, Smear, Treatment
The NCLEX gives you a hemoglobin of 9 and expects you to know which anemia it is. Picking iron supplements for a B12 deficiency wastes time while irreversible nerve damage progresses. MCV direction, smear findings, and one key lab narrow it to the correct type — and the correct intervention.
Master this comparison — play it or drill it.
Practice 45 NCLEX-style questions
Practice nowComparison
Side-by-side4 compared
Focus
Comparevs
Dimension
Iron Deficiency
B12 Deficiency
Folate Deficiency
Sickle Cell Disease
Pathophysiology & risk
- ↓ iron stores then ↓ Hgb synthesis
- Chronic blood loss (GI, menses)
- ↓ B12
- Pernicious anemia (no intrinsic factor)
- Gastrectomy, vegan diet, ileal resection
- ↓ folate intake/absorption
- Alcoholism, methotrexate, phenytoin
- Autosomal recessive Hgb SS
- RBCs sickle under hypoxia/dehydration
Signs & symptoms
- Pica + koilonychia (spoon nails)
- Paresthesias, ataxia, memory loss
- Smooth beefy-red tongue
- ★NO neuro symptoms (vs B12)
- Smooth beefy-red tongue
- ★Vaso-occlusive pain crises
- Jaundice, splenomegaly
Diagnostics & labs
- ↓ MCV (microcytic < 80)
- ↓ ferritin (most specific), ↑ TIBC
- ↑ MCV (macrocytic > 100)
- ★↓ B12, ↑ methylmalonic acid
- ↑ MCV (macrocytic > 100)
- ↓ folate, ↑ homocysteine, normal MMA
- Normal MCV
- Sickle cells on smear
- ★Hgb electrophoresis: ↑ Hgb S
Nursing priorities
- Give oral iron w/ vit C, empty stomach
- Find/treat blood-loss source
- Protect from injury (ataxia)
- Lifelong IM B12 if pernicious
- Replace folate
- Screen for alcohol use, poor diet
- Crisis: hydration, O₂, pain control
- Avoid triggers
- Monitor for splenic sequestration
Treatment & meds
- Oral ferrous sulfate
- IV iron if severe
- IM cyanocobalamin (lifelong if PA)
- Oral B12 if dietary cause
- Folic acid 1 mg/day PO
- Hydroxyurea ↑ Hgb F
- Crisis: IV fluids, O₂, opioids
- Exchange transfusion (ACS, stroke)
Patient teaching
- Stools turn dark green/black (expected)
- Avoid antacids/dairy within 2 hr of dose
- Lifelong injections if IF absent
- Report numbness/tingling early
- Take folate before & during pregnancy
- Limit alcohol
- Eat folate-rich foods (leafy greens)
- Avoid cold, high altitude, hypoxia
- Hydrate aggressively
- Genetic counseling
Red flags — escalate
- Severe anemia then high-output failure
- Subacute combined degeneration
- Pregnancy: fetal neural tube defects
- Acute chest syndrome
- splenic sequestration
- Stroke, priapism
Complications
- Child: developmental delay
- Cardiac strain, heart failure
- Permanent neurologic deficits
- Fetal NTDs
- Organ infarction
- Chronic pain
- Shortened life expectancy
Pathophysiology & risk
Iron Deficiency
- ↓ iron stores then ↓ Hgb synthesis
- Chronic blood loss (GI, menses)
B12 Deficiency
- ↓ B12
- Pernicious anemia (no intrinsic factor)
- Gastrectomy, vegan diet, ileal resection
Signs & symptoms
Iron Deficiency
- Pica + koilonychia (spoon nails)
B12 Deficiency
- Paresthesias, ataxia, memory loss
- Smooth beefy-red tongue
Diagnostics & labs
Iron Deficiency
- ↓ MCV (microcytic < 80)
- ↓ ferritin (most specific), ↑ TIBC
B12 Deficiency
- ↑ MCV (macrocytic > 100)
- ★↓ B12, ↑ methylmalonic acid
Nursing priorities
Iron Deficiency
- Give oral iron w/ vit C, empty stomach
- Find/treat blood-loss source
B12 Deficiency
- Protect from injury (ataxia)
- Lifelong IM B12 if pernicious
Treatment & meds
Iron Deficiency
- Oral ferrous sulfate
- IV iron if severe
B12 Deficiency
- IM cyanocobalamin (lifelong if PA)
- Oral B12 if dietary cause
Patient teaching
Iron Deficiency
- Stools turn dark green/black (expected)
- Avoid antacids/dairy within 2 hr of dose
B12 Deficiency
- Lifelong injections if IF absent
- Report numbness/tingling early
Red flags — escalate
Iron Deficiency
- Severe anemia then high-output failure
B12 Deficiency
- Subacute combined degeneration
Complications
Iron Deficiency
- Child: developmental delay
- Cardiac strain, heart failure
B12 Deficiency
- Permanent neurologic deficits
★ marks the fact that sets a column apart.
Tap the column each item belongs to — jump in and play, or just watch it run.
Play full screen for XPGame:
Clinical Pearl
Low MCV → check ferritin (iron). High MCV → check B12 vs folate. Normal MCV + crises → sickle cell.
Component Topics
Ready to master this comparison?
Get a personalized study plan built around this topic — free to try, no card needed.
Go further
- TopicIron-Deficiency AnemiaThe most common anemia worldwide hides behind vague fatigue — but one lab pattern and a handful of physical findings tell you exactly what's happening before the hemoglobin even…
- TopicOther AnemiasA patient's anemia won't resolve with iron supplements — and giving the wrong vitamin could mask a deficiency that permanently destroys the spinal cord. Knowing which anemia is…
- ComparisonBleeding vs Clotting Disorders: Thrombocytopenia vs DIC vs HemophiliaAll three disorders cause bleeding, but the lab panels look completely different. Pick the wrong pattern on the NCLEX and you'll choose platelet transfusion when the patient needs…
- ComparisonTransfusion Reaction Comparison: Hemolytic vs Febrile vs Allergic vs TACO vs TRALIFive transfusion reactions all start with "stop the transfusion" — but the next intervention is completely different for each. Giving furosemide saves the TACO patient and worsens…