Transferrin transports iron in the body to tissues that need it. This test examines the proportion of transferrin that has an iron atom attached.
Trace elements and minerals
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The transferrin receptor is a recipient molecule for the iron transport protein. It receives the iron transported to the red blood cell, facilitating the transfer of iron into the red blood cell. The concentration of the transferrin receptor in the blood increases in cases of iron deficiency. The S-TfR test is used to detect iron deficiency.