ALT (alanine aminotransferase) is an enzyme found mainly in the liver. When liver cells are damaged, ALT is released into the bloodstream, making it a key marker of liver health.
Category: Liver Function
Also known as: alt, sgpt, alanine aminotransferase, alanine transaminase, gpt
Reference range: 7–56 U/L (Source: ABIM)
Standard unit: U/L
High values may indicate
High ALT may indicate liver damage from hepatitis, fatty liver disease (NAFLD/NASH), cirrhosis, medication toxicity, or alcohol abuse.
Low values may indicate
Low ALT is generally not a clinical concern. Very low levels may occasionally be associated with vitamin B6 deficiency.