For quantitative determination of gama-glutamyl transferase enzyme activity in biological samples. Safe and sensitive. Non-radioactive assay. Use as little as 10 µ L of sample. Linear detection range in 96-well plate: 0.7 to 200 U/L activity. Fast and convenient. The procedure involves addition of a single ready-to-use reagent and incubation for 30 min. Room temperature assay. No 37°C incubator is needed. High-throughput. Can be readily automated to assay thousands of samples per day. Method: OD405nm; Samples: Serum, plasma, cell lysate, and other biological samples; Procedures: 30 min