| Material | serum or EDTA plasma or heparin plasma 0.5 ml |
| Method | photometry |
| Duration | Reporting of results on the day the sample is received (Mon–Sat) |
| Remark | - γ-GT is a membrane-bound enzyme found primarily in the liver and bile ducts. Elevated activity in serum/plasma occurs mainly in liver disease and cholestasis.
- Horse: Significant increase in activity in cholestasis. Elevated concentrations may also be seen in other diseases with liver involvement (e.g. colic, enteritis).
- Cattle: γ-GT correlates with the degree of hepatic fatty degeneration and parenchymal swelling.
- After colostrum intake, ruminant neonates physiologically show very high γ-GT concentrations in serum/plasma during the first week of life.
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