Liver Function Tests (LFTs) are a group of blood tests used to assess the health and function of the liver. These tests measure levels of enzymes, proteins, and other substances produced by the liver, aiding in the diagnosis and monitoring of liver diseases and conditions. Common LFTs include alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), and bilirubin levels.