Gamma-glutamyl transpeptidase

Label Mnemonic:	GGT
Epic code:	LAB85
Order form:	Laboratory Requisition
Supply order:	Supply Order Form
Billing:	Billing Policies
CPT code:	82977

Specimen(s):

Plasma

Collection Medium:

Plasma Separator Tube 4.5 mL

Alternate Collection Media:

Call laboratory for additional acceptable specimen collection containers.

Minimum:

3 mL whole blood in light green top tube or ONE Microtainer^® for pediatric patients

Testing Schedule:

24 hrs/day, 7 days a week, including holidays.

Turn Around Time:

1 hour (upon receipt in laboratory)

Reference Range:

Male   8-61 U/L
Female 5-36 U/L

Comments:

Elevated by drugs such as Phenobarbital and Dilantin.

Please print, complete and submit the Advance Beneficiary 
Notice (ABN) along with the Laboratory Requisition before shipping 
the specimen.

Test Limitations:

Criterion: Recovery within plus or minus 10% of initial value. 

Icterus: No significant interference up to an I index of 50 
(approximate unconjugated bilirubin concentration:35 mg/dL). 

Hemolysis: No significant interference up to an H index of 200 mg/dL 
(approximate hemoglobin concentration: 200 mg/dL). 

Lipemia (Intralipid): No significant interference up to an L index of 
700 mg/dL (approximate triglycerides concentration: 1400 mg/dL).There 
is poor correlation between turbidity and triglycerides concentration.

Reference:
Glick MR, Ryder KW, Jackson SA. Graphical Comparisons of Interferences 
in Clinical Chemistry Instrumentation. Clin Chem 1986;32:470-474.

Methodology:

Enzymatic

Sample Processing:

Centrifuge at a speed and time necessary to get barrier separation of plasma/serum and cells within 1 hour of collection. Send specimen in original tube. Do Not transfer to another tube.
Each sample must be labeled with at least TWO full patient identifiers (First/Last Name & DOB are sufficient for non-UIHC affiliated clients) to avoid sample rejection/delays.

Sample Storage:

Refrigerate.
All sample storage requirements are intended for delivery to UIHC within 24 hours of collection for testing. If samples won't arrive in this time period, please call the UIHC Core Lab for alternative storage/shipping instructions (319-356-3527).

Transport Instructions:

Place labeled specimen into zip-lock type biohazard bag; seal bag.
Place completed requisition into outside pocket of bag.
Transport in cooler with refrigerated coolant packs.

CPT Code:

82977