Liver function tests (LFTs) are a panel of blood tests that assess the liver's health by measuring enzymes, proteins, and substances produced or processed by the liver, such as alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), bilirubin, and albumin. These tests are crucial for diagnosing liver diseases, monitoring liver function, and guiding treatment decisions. Elevated liver enzymes, for instance, can indicate conditions like hepatitis or liver cirrhosis.