High concentrations of GGT are found in the liver, bile ducts, and the
kidney. Hence
kidney and urinary
problems could be causing the
high GGT level. Greater-than-normal levels of GGT may indicate: congestive heart failure, cholestasis (congestion of the bile ducts), cirrhosis, hepatitis, liver ischemia (blood flow deficiency), liver necrosis, liver tumor, high alcohol intake, use of hepatotoxic drugs (drugs toxic to liver).