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General Medicine · Haematology: anaemia of chronic disease
Sample itemA patient with rheumatoid arthritis has MCV of 80 fL, serum iron low, TIBC low and ferritin of 400 ng/mL. What is the mechanism?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
A. Hepcidin-mediated iron sequestration by inflammation
Inflammatory cytokines such as IL-6 raise hepcidin, which blocks ferroportin and traps iron in macrophages, giving low serum iron and TIBC with normal or high ferritin. Anaemia is usually normocytic to mildly microcytic. Treating the underlying disease improves it.
Option by option
A. Hepcidin-mediated iron sequestration by inflammation (correct)
Correct. Hepcidin causes functional iron restriction.
B. Vitamin B12 deficiency
B12 deficiency causes macrocytosis.
C. Chronic blood loss
Blood loss would give low ferritin and high TIBC.
D. Defective globin synthesis
Globin defects occur in thalassaemia.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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