Alanine-aminotransferase (ALT, SGPT)

Liver Health

A healthy result should fall into the range 7 - 55 U/L, or 7.00 - 55.00 IU/L.

Alanine-aminotransferase (ALT), formerly called serum glutamic pyruvic transaminase, is an enzyme produced by the liver and found in blood. Its primary function is to serve as a catalyst for chemical reactions.  A healthy human body will naturally display low levels of ALT; however, when the liver is damaged or diseased it will release ALT into the bloodstream causing ALT levels to rise. As such, an ALT test is typically done to identify liver diseases, especially cirrhosis and hepatitis.  ALT tests can also be used to keep track of medications that can damage the liver. If a person has jaundice (yellowing of the skin or eyes) an ALT test can determine whether a blood disorder or liver disease is the cause. However, ALT is a liver-specific enzyme and elevated levels typically indicate a problem with liver cell integrity. Further, ALT tests may be done in tandem with an alkaline phosphatase test to distinguish liver damage from a bile duct problem. 

Normal Ranges in U/L:

Male: 5-63  U/L
Female: 5-54  U/L

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