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Gamma Glutamyl Transferase (GGT)

Test Code
GGT


Preferred Specimen
1 mL serum


Minimum Volume
0.5 mL


Other Acceptable Specimens
Heparinized plasma


Transport Container
Serum separator tube (SST)


Transport Temperature
Ambient


Specimen Stability
 Ambeint: 7 days
Refrigerated: 7 days


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Plasma


Methodology
Spectrophotometry (SP)

Setup Schedule
24/7


Report Available
Same day


Reference Range
Males: 11-65 IU/L
Females: 11-43 IU/L


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.




The CPT Codes provided in this document 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 payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.