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The University of Chicago Medicine Laboratories

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Specimen Collection and Handling

Transfusion

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Mayo Clinic Laboratories

Test Code GGT Gamma Glutamyl Transpeptidase (GGT)

Specimen and Container/Tube

Specimen Type: Plasma

Preferred Specimen: Li-Heparin Mint Green Top

Other Acceptable specimens: Serum/Gold Top, Serum/Red Top

Volume

Preferred Volume: 0.5 mL

Minimum Volume: 0.2 mL

Specimen Stability

Storage Temperature

Stability

Room temperature

7 Days

Refrigerated

7 Days

Frozen

1 Year

Specimen Handling and Transport Instructions

UCMC Onsite Instructions: 

Collect specimen per standard collection procedure and send to laboratory immediately. 

 

UCMC Offsite and UC MedLab Outreach Instructions: 

  • Samples should be centrifuged within 2 hours of collection.
  • Centrifuge specimens at >2500 x g for 10 minutes at room temperature.
  • Aliquot sample into plastic transport tube containing a minimum of 0.2 mL of specimen.
  • Samples must be sent room temperature at 15-25oC.

Rejection Criteria

  • Common specimen rejected situations include: incorrect specimen type, insufficient volume, missing or incomplete specimen identifiers, incorrect specimen transport, or specimens outside stability limits. 
  • Specimens that are clotted or grossly hemolyzed.
  • Specimens that were transported unspun/whole blood and draw time is greater than 6 hours.

Reference Values

 

Test

Age

Sex

Reference Range

GGT

All

Male

11 - 63 IU/L

GGT

All

Female

8 - 35 IU/L

Note: Reference range based on in-house studies, recommendations from Tietz Textbook of Clinical Chemistry, and Roche product literature. 

Clinical Indications

Gamma-glutamyltransferase is used in the diagnosis and monitoring of hepatobiliary diseases. Gamma-glutamyltransferase is also a sensitive screening test for occult alcoholism.

Test Components

Gamma Glutamyl Transpeptidase (GGT)

Methodology

 Enzymatic Colorimetric Spectrophotometric (Roche Diagnostics)

CPT Codes

82977

Additional Information

  • Results should always be assessed in conjunction with patient's medical history, clinical examination and other findings.

Last Review Date

02/24/2023

Collection Instructions

Collect specimen per standard laboratory collection procedures. 

 

Critical Values

Analyte

Unit

Low

High

Age

N/A

N/A

N/A

N/A

N/A

LOINC Codes

2324-2

Turnaround Time

Turnaround times are relative to the time the specimen is received in the test laboratory. 

 

STAT Turnaround Time: N/A

Routine Turnaround Time: 4 hours

Testing Schedule: 24/7

Synonyms/Keyword Search

N/A