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Test Code GGT.1 GAMMA GLUTAMYL TRANSPEPTIDASE

Methodology

Multiple-point Rate

Useful for diagnosing and monitoring hepatobiliary disease. GGT is currently the most sensitive enzymatic indicator of liver disease. GGT in serum can be used to ascertain whether observed elevations of alkaline phosphatase are due to skeletal disease (normal GGT) or reflect the presence of hepatobiliary disease (elevated GGT). GGT is also used as a screening test for occult alcoholism.

Specimen Requirements

 

Submit only 1 of the following specimens:

 

Preferred:

Serum

Serum Gel Tube

Container/Tube: Serum gel tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of serum-Hemolyzed specimen is not acceptable.

Collection Instructions: Spin down within 4 hours of draw.

Note: Label specimen appropriately (serum).

 

Alternate:

Serum

Plain, Red-Top Tube

Container/Tube: Plain, red-top tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of serum-Hemolyzed specimen is not acceptable.

Collection Instructions: Spin down within 4 hours of draw.

Note: Label specimen appropriately (serum).

 

Alternate:

Plasma

Container/Tube: Green-top (lithium heparin) tube(s)

Specimen Volume: 1 mL (minimum volume: 0.5 mL) of plasma-Hemolyzed specimen is not acceptable.

Collection Instructions: Spin down within 4 hours of draw.

Note: Label specimen appropriately (plasma).

Day(s) Test Set Up

Monday through Sunday

Reference Values

<1 month: 12-271 units/L

1-2 months: 9-159 units/L

2-4 months: 7-98 units/L

4-7 months: 5-45 units/L

7 months-10 years: 6-25 units/L

10-19 years: 11-45 units/L

>19 years: 8-78 units/L

Performing Laboratory

Logan Health Medical Center-Chemistry

Test Classification and CPT Coding

82977

Specimen Transport Temperature

Refrigerate