An “ALT” or alanine aminotransferase test, formerly known as SGPT, is a blood test that measures the amount of ALT enzyme in the blood to help diagnose liver damage or disease. An elevated ALT level indicates injury to liver cells, and the test is used to identify liver disease, monitor treatment, or determine the cause of symptoms like jaundice. It’s often performed alongside other tests and can be affected by factors like alcohol consumption, certain medications, and other medical conditions