Earliest change in iron deficiency anaemia is
Correct Answer: Decreased serum ferritin
Description: Ferritin is a blood cell protein that contains iron. A ferritin test helps your doctor understand how much iron your body is storing. If a ferritin test reveals that your blood ferritin level is lower than normal, it indicates your body's iron stores are low and you have iron deficiency Ref:guyton and hall textbook of medical physiology 12 edition page number:118,119,120
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Physiology
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