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HelpTest Code 137 Gamma Glutamyltransferase (GGT)
Additional Codes
ALAB: GGT
PowerChart: GGT (Gamma Glutamyl Transferase)
MA Cerner: GGT Gamma Glutamyl Transferase.
Test Method
MercyOne: Enzymatic Rate Method; Beckman DxC700AU
MA: Enzymatic Colorimetric Method; Roche Cobas 6000
Specimen Requirement
0.5 mL serum is required.
Additional Specimen Collection Information
Collect blood in a red-top tube. SST (gel tubes) are acceptable. Serum should be separated from contact with the cells within 2 hours of collection. Specimens not centrifuged within 4 hours of collection may be rejected. Refrigerate the specimen if unable to assay within 8 hours of collection. Hemolyzed specimens are not acceptable. If sample is stored longer than 1 month, freeze at -20 C. Frozen samples should be thawed only once.
Performance
Testing is performed Monday through Sunday.
Routine orders: Typically completed within 4 hours; Mercy DV and MA East & West within 24 hours
Expedite orders: Typically completed within 1 hour after the specimen arrives at the testing site.
STAT orders: Typically completed within 30 minutes after the specimen arrives at the testing site.
Reference Values
7-63 IU/L
CPT Code Information
82977 Chemistry: Glutamylransferase, gamma (GGT)
Useful For
Diagnosis and monitoring of hepatobiliary disease, it is currently the most sensitive enzymatic indicator of liver disease
To ascertain whether observed elevations of alkaline phosphatase are due to skeletal disease (normal GGT) or reflect the presence of hepatobiliary disease (elevated GGT)
A screening test for occult alcoholism
LOINC Code Information
2324-2 Gamma Glutamyl Transferase [Enzymatic Activity/Volume] In Serum Or Plasma