The 'Mentzer Index' (MCV/RBC count) is used to differentiate between iron deficiency and which other condition?
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Correct answer: Thalassemia trait
In iron deficiency, both MCV and RBC count are low (Mentzer index > 13). In Thalassemia trait, the MCV is very low but the RBC count is often normal or high (Mentzer index < 13), as the marrow overcompensates for the globin defect.
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