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21 GGTP (GAMMA-GT)




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This article is from the Interpretation Of Lab Test Profiles, by Ed Uthman uthman@neosoft.com with numerous contributions by others.

21 GGTP (GAMMA-GT)

Gamma-glutamyltransferase is markedly increased in lesions
which cause intrahepatic or extrahepatic obstruction of bile
ducts, including parenchymatous liver diseases with a major
cholestatic component (e.g., cholestatic hepatitis). Lesser
elevations of gamma-GT are seen in other liver diseases, and in
infectious mononucleosis, hyperthyroidism, myotonic dystrophy,
and after renal allograft. Drugs causing hepatocellular damage
and cholestasis may also cause gamma-GT elevation (see under
"Total bilirubin," below).

Gamma-GT is a very sensitive test for liver damage, and
unexpected, unexplained mild elevations are common. Alcohol
consumption is a common culprit.

Decreased gamma-GT is not clinically significant.

 

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