Serum gamma-glutamyl transferase level measurement is the quantification of gamma-glutamyl transferase in blood. Gamma-glutamyl transferase is used as a marker for liver/bile duct problems and alcohol abuse. The trait is EFO_0004532 (serum gamma-glutamyl transferase measurement). Also known as: GGT measurement, Gamma gluatamyl transferase levels, Gamma glutamyl transpeptidase levels, gamma glutamyl transferase measurement.