Albumin

Albumin is the most common protein in blood plasma and is produced in the liver. It retains fluid in the vascular system and transports vitamins, enzymes, and hormones.

A deficiency may be caused by liver or kidney diseases, inflammation, or poor protein supply. High albumin levels occur with fluid loss or a very high-protein diet. Since albumin also reflects the nutritional situation, persistently low levels indicate insufficient protein intake and an increased risk of muscle weakness or infections.