Alanine aminotransferase

Alanine aminotransferase (ALT) is an enzyme found primarily in liver cells that leaks into the bloodstream when liver tissue is damaged or inflamed. This blood test measures ALT levels to assess liver health and detect conditions like hepatitis, fatty liver disease, cirrhosis, or medication-related liver injury. Elevated ALT typically indicates liver damage or disease, while normal levels suggest the liver is functioning properly. ALT is often part of routine health screening and is essential for monitoring patients taking medications known to affect the liver.