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Test Code Billings Clinic: 4026 Gamma-Glutamyltransferase (GGT), Plasma or Serum

Performing Laboratory

Billings Clinic Laboratory: Chemistry

Useful For

  • Diagnosing and monitoring hepatobiliary disease, it is currently the most sensitive enzymatic indicator of liver disease
  • Ascertaining whether observed elevations of alkaline phosphatase are due to skeletal disease (normal gamma-glutamyltransferase: GGT) or reflect the presence of hepatobiliary disease (elevated GGT)
  • A screening test for occult alcoholism

Methodology

GCNA/ Calibrated/37°C / bichromatic rate

Specimen Requirements

Submit only 1 of the following specimens:

Serum or plasma should be physically separated from cells as soon as possible with a maximum limit of two hours from the time of collection.

 

Plasma

  • Draw blood in a green-top (lithium heparin) tube(s).
  • Spin down and send 1.0 mL of heparinized plasma frozen.

 

Serum

  • Draw blood in a plain, red-top tube(s) or a serum gel tube(s).
  • Spin down and send 1.0 mL of serum frozen

Storage/Stability

Specimen Type Temperature Time
Plasma, Serum Refrigerated 7 days
  Frozen (preferred) 6 months
  Ambient 7 days

 

Reject Due To

  • Gross Icterus

Reference Values

Males:     

0 - 1 month                   13 - 147 U/L

1 - 2 months                 12 - 123 U/L

2 - 4 months                   8 - 90   IU/L

4 months - 10 years       5 - 32   U/L

10 - 15 years                  5 - 24   U/L

> 15 years                    15 - 85   U/L


Females:

0 - 1 month                   13 - 147 U/L

1 - 2 months                 12 - 123 U/L

2 - 4 months                   8 - 90   U/L

4 months - 10 years       5 - 32   U/L

10 - 15 years                  5 - 24   U/L

> 15 years                      5 - 55   U/L

 

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

82977 - Glutamyltransferase, gamma (GGT)


LCD or NCD test. ICD-10 code is required for this test. When appropriate, obtain a properly executed ABN and submit the ABN with test order(s). See “Medical Necessity and Advanced Beneficiary Notice (ABN) Policy and Form” under
"Resources" for a copy of a form and additional information.

LOINC Code Information

Reporting Name LOINC Code
GGT 2324-2