Transferrin is a blood-plasma glycoprotein, which plays a crucial role in iron metabolism and is responsible for ferric-ion delivery. It is synthesised in the liver. Transferrin functions as the most critical ferric pool in the body. It transports iron, via blood to various tissues such as the liver, spleen, and bone marrow. Anti-human transferrin is used to directly measure the level of iron in the blood and the body’s ability to transport iron in the blood. The tests help diagnose chronic iron overload or deficiency.