what is ggt blood test
GGT/GGTP blood test. This is one of the liver function tests (LFTs), and GGT is the liver enzyme most sensitive to liver disease 4, especially the etiologies having to do with cholestatic injury or biliary tract areas causing any obstruction.his is one of the liver function tests (LFTs), and GGT is the liver enzyme most sensitive to liver disease 4, especially the etiologies having to do with cholestatic injury or biliary tract areas causing any obstruction.