Glucose Tolerance Test-Additional Specimens

Label Mnemonic:	GT05
Epic code:	LAB4923
Order form:	Laboratory Requisition
Supply order:	Supply Order Form
Billing:	Billing Policies
CPT code:	82952 for each additional specimens

Specimen(s):

Plasma

Collection Medium:

	or
Gray top tube 6 mL (Na Fluoride)	or	Plasma Separator Tube 4.5 mL (Centrifuge Immediately)

Minimum:

3 mL whole blood for extra specimen (added to GTT series)

Testing Schedule:

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

Turn Around Time:

1 hour (upon receipt in laboratory)

Test Limitations:

Icterus: No significant interference up to an I index of 60 (approximate conjugated and unconjugated bilirubin concentration: 60 mg/dL).

Hemolysis: No significant interference up to an H index of 1000 (approximate hemoglobin concentration 1000 mg/dL).

Lipemia (Intralipid): No significant interference up to an L index of 1000 (approximate triglycerides concentration 2000 mg/dL). There is poor correlation between turbidity and triglycerides concentration.

Methodology:

Hexokinase/UV Test

Instructions:

Gray top (Na Fluoride) collections: Transport whole blood to the laboratory within 24 hours.

Sample Processing:

Centrifuge within one hour of draw time.
Centrifuge at a speed and time necessary to get barrier separation of plasma/serum and cells.
Separate plasma or serum into labeled container and cap.

Sample Storage:

Refrigerate.

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.