Normal values for alanine aminotransferase range from 0-40 U/L and may vary slightly from hospital to hospital and from test to test. Alanine aminotransferase is an indicator of liver function, and usually ranges from 0-40 U/L. Elevated values indicate possible liver cell damage. When liver cells are damaged, alanine aminotransferase enters the bloodstream in large quantities, resulting in an elevated alanine aminotransferase serum test. When alanine aminotransferase is abnormally elevated, the patient should undergo further liver tests, such as liver imaging, liver disease autoantibodies, and other related tests. Tests for viral hepatitis, such as hepatitis A, C, B, and E tests, are also needed to clarify the presence of viral hepatitis. Alcohol and certain medications can also cause an increase in alanine aminotransferase, which may require abstinence from alcohol and medications. If alanine aminotransferase is abnormal, it is recommended to consult a doctor for a complete examination, and a combination of other conditions is needed to clarify the diagnosis and treatment.