Albumin is a protein made by the liver. It makes up about 60% of the total protein in the blood and plays many roles. It keeps fluid from leaking out of blood vessels; nourishes tissues; and transports hormones, vitamins, drugs, and ions like calcium throughout the body. The concentration of albumin in the blood is a reflection of liver function and of nutritional status. This test measures the level of albumin in the blood.
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