Albumin is a protein that is produced in the liver. Albumin enters the bloodstream where it helps carry vitamins, enzymes, and other important substances. Albumin also helps prevent fluids from leaking out of the bloodstream.

An albumin blood test measures the amount of albumin in a sample of your blood. It can be used to help identify various health conditions, including problems that affect the liver and kidney. Albumin may be tested alone or in a panel of measurements such as the comprehensive metabolic panel or liver panel.