Required section · Section 1 of 6

A microcytic result is a pattern

An adult outpatient CBC shows hemoglobin 94 g/L, mean corpuscular volume (MCV) 72 fL, and red cell distribution width (RDW) 17.8%. The analyzer flags microcytosis and anisocytosis. Microcytosis is a pattern, not a diagnosis, so the question is which combination of CBC, smear, iron studies, and context best separates the plausible patterns.

Interpret MCV beside hemoglobin, RBC count, RDW, peripheral smear, and iron studies. Iron deficiency and thalassemia trait are common causes, but inflammation, sideroblastic processes, and lead-related findings remain relevant look-alikes. A low MCV alone does not release a disease label.

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Knowledge check 1

Which first interpretation is supported by an MCV of 72 fL with anemia?

Choose one option.

Microcytosis is present and requires integration with CBC, smear, iron studies, and context.

Thalassemia is established by the low MCV.

Iron deficiency is proven and its cause is identified.

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