Highly Elevated Plasma γ‐Glutamyltransferase Elevations: A Trait Caused by γ‐Glutamyltransferase 1 Transmembrane Mutations

Supported by Jubiläumsfonds der Österreichischen Nationalbank (16678) and the Department of Innovation, Research and University of the Autonomous Province of Bolzano/Bozen, Italy. Potential conflict of interest: Nothing to report. Assay of γ‐glutamyltransferase (GGT) activity is a widely used test to indicate and monitor liver and biliary tract injury. We observed dominant inheritance of highly elevated plasma GGT levels, designated GGTemia, in...