Which iron parameter is decreased in a microcytic anemia due to iron deficiency?

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Study for the NBME Form 13 Test with our comprehensive quiz collection, featuring flashcards and multiple-choice questions to ensure your readiness. Enhance your knowledge with detailed explanations for each question.

Multiple Choice

Which iron parameter is decreased in a microcytic anemia due to iron deficiency?

Explanation:
Ferritin reflects stored iron. In iron deficiency, those iron stores are depleted, so ferritin levels fall. This decrease helps distinguish iron deficiency from other causes of anemia where ferritin might be normal or elevated (such as inflammation). In contrast, total iron-binding capacity increases in iron deficiency as the body makes more transferrin to scavenge iron, and serum iron with transferrin saturation fall. Thus the parameter that decreases in this scenario is ferritin.

Ferritin reflects stored iron. In iron deficiency, those iron stores are depleted, so ferritin levels fall. This decrease helps distinguish iron deficiency from other causes of anemia where ferritin might be normal or elevated (such as inflammation). In contrast, total iron-binding capacity increases in iron deficiency as the body makes more transferrin to scavenge iron, and serum iron with transferrin saturation fall. Thus the parameter that decreases in this scenario is ferritin.

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