Albumin is the most abundant protein found in human blood plasma, primarily produced by the liver. It acts as a vital carrier molecule, transporting essential substances like hormones, vitamins, enzymes, and medications throughout the body.

Crucially, albumin maintains oncotic pressure, a counter-pressure that prevents fluid from leaking out of blood vessels into surrounding tissues.

A simple blood test measuring albumin levels helps evaluate liver function, kidney health, and nutritional status. Low levels often signal underlying issues, such as liver disease, kidney malfunction, or severe malnutrition, causing fluid buildup and swelling (edema) in the body.