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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

Collection Instructions

Collect specimen per standard laboratory collection procedures. 

 

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.

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. 

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

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.

Critical Values

Analyte

Unit

Low

High

Age

N/A

N/A

N/A

N/A

N/A

Test Components

Gamma Glutamyl Transpeptidase (GGT)

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.

Methodology

 Enzymatic Colorimetric Spectrophotometric (Roche Diagnostics)

CPT Codes

82977

LOINC Codes

2324-2

Additional Information

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

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

Last Review Date

02/24/2023