Microcytic Anemia Differential

MCV/hemoglobin trend model differentiating iron deficiency, thalassemia, and anemia of chronic disease.

Current Stage

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MCV estimate

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Iron deficiency

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Thalassemia

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Most likely dx

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Ferritin level (ng/mL)30

TIBC (µg/dL)350

Normocytic red cell

Microcytic red cell

Iron deficiency branch

Thalassemia branch

Chronic disease branch

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Reading the Serial MCV and Hemoglobin Trend

Placeholder: falling MCV over time signals developing microcytosis.

80–100 fL: Normal MCV (Placeholder reference range)
<80 fL: Microcytic threshold (Placeholder cutoff)
3–6 mo: Hgb trend window (Placeholder monitoring interval)
High: Trend sensitivity (Placeholder trend note)

Why trend beats a single value

Placeholder: a single MCV can miss early drift; trend lines catch it sooner.

Ferritin as an Iron Store Marker

Placeholder: low ferritin indicates depleted iron stores.

<30 ng/mL: Low ferritin (Placeholder iron-deficient cutoff)
30–200 ng/mL: Normal range (Placeholder reference band)
2–3×: Acute phase rise (Placeholder inflammation effect)
High: Diagnostic weight (Placeholder utility note)

Ferritin pitfalls in inflammation

Placeholder: ferritin rises as an acute phase reactant, masking true deficiency.

TIBC and Transferrin Saturation Interpretation

Placeholder: TIBC rises in iron deficiency and falls in chronic disease.

250–400 µg/dL: Normal TIBC (Placeholder reference range)
>400 µg/dL: High TIBC pattern (Placeholder iron-deficient signal)
<15%: Transferrin sat. (Placeholder deficiency marker)
Low/normal: ACD TIBC (Placeholder chronic disease pattern)

Combining TIBC with ferritin

Placeholder: paired interpretation of TIBC and ferritin sharpens the differential.

Splitting Iron Deficiency from Thalassemia Trait

Placeholder: normal iron studies with microcytosis suggest thalassemia.

<13: Mentzer index (Placeholder thalassemia hint)
Normal: RDW (Placeholder thalassemia feature)
Normal: Iron studies (Placeholder thalassemia pattern)
Hgb electrophoresis: Confirmation test (Placeholder next step)

When to order hemoglobin electrophoresis

Placeholder: order electrophoresis when iron studies are normal but MCV stays low.

Placeholder: disproportionately low MCV relative to anemia severity flags thalassemia.

Recognizing the Anemia of Chronic Disease Pattern

Placeholder: high ferritin with low TIBC reflects iron sequestration.

Normal/high: Ferritin (Placeholder ACD pattern)
Low: TIBC (Placeholder ACD pattern)
Elevated: Hepcidin (Placeholder mediator)
Mild low/normal: MCV (Placeholder severity note)

Hepcidin-driven iron sequestration

Placeholder: inflammation raises hepcidin, trapping iron in stores.