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22653 Gamma Glutamyl Transferase

Gamma Glutamyl Transferase
Test Code: GGT
Synonyms/Keywords
​GGT, GGTP, Gamma GT, Gamma Glutmyl Trans​
Useful For
GGT activity is elevated in any and all forms of liver disease.  It is highest in biliary obstruction, rising earlier and remaining elevated longer than other enzymes.  Moderate elevations are seen in infectious hepatitis.  In acute and chronic pancreatitis, GGT activity may be 5 -15 times normal.  GGT is considered a marker for alcohol abuse.​
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
​No Plasma​/SerumLithium-heparin Plasma Separator (PST)​, Serum Separator Tube (SST)Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT)
1 mL​0.3 mL​0.6 mL whole blood​
Specimen Stability Information
Specimen Type Temperature Time
Plasma/Serum​ ​ ​ Ambient​ 5 days​
Refrigerate​ 7 days​
Frozen​ 1 year​
Rejection Criteria
Grossly hemolyzed samples
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Diagnostic Treatment Center​ ​Monday through Sunday​ ​Less than 2 hours​ ​Bichromatic Rate Technique/Siemens Dimension
​Eau Claire ​Monday through Sunday​ ​Less than 2 hours​ ​​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
​Flambeau Hospital ​Monday through Sunday​ Less than 2 hours​​
​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
​Ladysmith
​Monday through Sunday
​Less than 2 hours
​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
Lakeview Medical Center​ ​Monday through Sunday​ ​Less than 2 hours​ ​​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
Marshfield​ Monday through Sunday​ Less than 2 hours​ Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
​Minocqua
​Monday through Sunday
​Less than 2 hours
​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU​
​Stevens Point

​​Monday through Sunday​
​​Less than 2 hours​
​​​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU​
Reference Range Information
Performing Location Reference Range

​All Performing Sites using

Dimension Analyzer

 ​Male:
    0-11 yrs.:      0-20 U/L
12-<19 yrs.:      0-25 U/L 
  >= 19 yrs.:    10-80 U/L
Female:
 0-<19 yrs.:      0-20 U/L 
 >= 19 yrs.:      8-65 U/L​
All Performing Sites using Beckman AU Analyzer​
 Male:
   0-11 yrs:     <=20 U/L
12-<19 yrs:    <=25 U/L 
  >= 19 yrs:    <=64 U/L
Female:
 0 -<19 yrs:    <=20 U/L 
 >= 19 yrs.:    <=43 U/L​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82977 ​ ​ ​ ​ ​
Synonyms/Keywords
​GGT, GGTP, Gamma GT, Gamma Glutmyl Trans​
Ordering Applications
Ordering Application Description
​Centricity ​Gamma GT (GGT) (SGGT)
Cerner​ ​GGT
​COM ​GGT - Gamma Glutamyl Trans
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
​No Plasma​/SerumLithium-heparin Plasma Separator (PST)​, Serum Separator Tube (SST)Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT)
1 mL​0.3 mL​0.6 mL whole blood​
Specimen Stability Information
Specimen Type Temperature Time
Plasma/Serum​ ​ ​ Ambient​ 5 days​
Refrigerate​ 7 days​
Frozen​ 1 year​
Rejection Criteria
Grossly hemolyzed samples
Useful For
GGT activity is elevated in any and all forms of liver disease.  It is highest in biliary obstruction, rising earlier and remaining elevated longer than other enzymes.  Moderate elevations are seen in infectious hepatitis.  In acute and chronic pancreatitis, GGT activity may be 5 -15 times normal.  GGT is considered a marker for alcohol abuse.​
Reference Range Information
Performing Location Reference Range

​All Performing Sites using

Dimension Analyzer

 ​Male:
    0-11 yrs.:      0-20 U/L
12-<19 yrs.:      0-25 U/L 
  >= 19 yrs.:    10-80 U/L
Female:
 0-<19 yrs.:      0-20 U/L 
 >= 19 yrs.:      8-65 U/L​
All Performing Sites using Beckman AU Analyzer​
 Male:
   0-11 yrs:     <=20 U/L
12-<19 yrs:    <=25 U/L 
  >= 19 yrs:    <=64 U/L
Female:
 0 -<19 yrs:    <=20 U/L 
 >= 19 yrs.:    <=43 U/L​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Diagnostic Treatment Center​ ​Monday through Sunday​ ​Less than 2 hours​ ​Bichromatic Rate Technique/Siemens Dimension
​Eau Claire ​Monday through Sunday​ ​Less than 2 hours​ ​​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
​Flambeau Hospital ​Monday through Sunday​ Less than 2 hours​​
​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
​Ladysmith
​Monday through Sunday
​Less than 2 hours
​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
Lakeview Medical Center​ ​Monday through Sunday​ ​Less than 2 hours​ ​​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
Marshfield​ Monday through Sunday​ Less than 2 hours​ Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU
​Minocqua
​Monday through Sunday
​Less than 2 hours
​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU​
​Stevens Point

​​Monday through Sunday​
​​Less than 2 hours​
​​​​Glutamyl-carboxy-p-nitroanilide Rate Assay/Beckman AU​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82977 ​ ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.