Liver function tests measure certain proteins, enzymes, and substances, including:
- Albumin, a protein that the liver makes
- Total protein (TP)
- Enzymes that are found in the liver, including alanine transaminase (ALT), aspartate transaminase (AST), alkaline phosphatase (ALP), and gamma-glutamyl transpeptidase (GGT)
- Bilirubin, a yellow substance that is part of bile.