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Test Name

Gamma Glutamyl Transferase (GGT)

CPT Code(s)

82977

Methodology

Spectrophotometry (SP)

Reference Range(s)

  Male (U/L) Female (U/L)
<6 Months 12-122 15-132
6-11 Months  ≤39  ≤39
1-12 Years 3-22 3-22
13-15 Years 8-32 7-18
16-19 Years 9-31 6-26
20-29 Years 3-70 3-40
30-39 Years 3-90 3-50
40-54 Years 3-95  
40-49 Years   3-55
50-59 Years   3-70
55-59 Years 3-85  
≥60 Years 3-70 3-65

Clinical Significance

Elevated GGT is found in all forms of liver disease. Measurement of GGT is used in the diagnosis and treatment of alcoholic cirrhosis, as well as primary and secondary liver tumors. It is more sensitive than alkaline phosphatase, the transaminases, and leucine aminopeptidase in detecting obstructive jaundice, cholangitis, and cholecystitis. Normal levels of GGT are seen in skeletal diseases; thus, GGT in serum can be used to ascertain whether a disease, suggested by elevated alkaline phosphatase, is skeletal or hepatobiliary.

Alternative Name(s)

GGT

To view specimen requirements and codes please Select a regional laboratory.

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Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

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Gamma Glutamyl Transferase (GGT)
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