CPT Code:


Test Type: Serum Kit Based
Stability Time:


Refrigerated: 7 days

Reference Range:


  • Optimal: <35 U/L
  • Borderline: 35-70 U/L
  • Increased Risk: >70 U/L


  • Optimal: <60 U/L
  • Borderline: 60-120 U/L
  • Increased Risk: >120 U/L


Gamma-glutamyl transferase (GGT) is used in the diagnoses and monitoring of hepatobiliary disorders such as fatty, alcoholic and chronic liver diseases.

GGT is an indirect measure of increased oxidative stress and moderately elevated levels are associated with CVD, metabolic syndrome, type 2 diabetes, hypertriglyceridemia, and fatty liver disease. Significantly elevated or high-risk values are observed in patients with chronic liver and alcoholic liver diseases.

Methodology - Enzymatic Colorimetric

Collection Details:

Collection Instructions:

Preferred Specimen

1.0 mL serum (0.5 mL minimum) collected in serum separator tube (SST / Tiger Top)


Transport Temperature

Refrigerated (ship on frozen cold packs)