Tissue Distribution and Blood Levels of Gamma‐Glutamyl Transferase in the Horse

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Abstract
In the horse, .gamma.-glutamyl transferase (GGT, E.C. 2.3.2.2) was mainly located in the kidneys, liver and pancreas. As renal lesions are followed by a urinary escape of enzyme, it can be assumed that if there are raised serum enzyme levels then the source will be chiefly from the liver and pancreas. In the blood, GGT can be measured either in plasma or serum. Its mean level in 58 horses was 12 U/l. This level was not affected by moderate dilution or slight hemolysis and its activity was only slightly decreased by storage at -30.degree. C. The relative hepatic specificity of this enzyme and its easy measurement make it a potentially very useful measure of liver dysfunction in the horse.

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