Glucose Tolerance Test, 4 Specimens
Also known as 3 HR GTT (4 Specimens), 3 HR Glucose Tolerance, Non-pregnant, Glucose Tolerance 3 HR
Before the visit
Fasting required
Fasting required. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing.
Specimen
- Specimen
- Four - 1 mL plasma specimens collected in fluoride/oxalate (gray-top) tubes
- Minimum volume
- 0.5 mL for each specimen
- Also accepted
- Plasma from fluoride/oxalate (gray-top) tube in a plastic screw-cap vial • Serum (separated from cells immediately) in a plastic screw-cap vial • Spun SST • Plasma from lithium heparin (green-top) tube in a plastic screw-cap vial • Plasma from sodium heparin (green-top) tube in a plastic screw-cap vial
- Container
- Fluoride/oxalate (gray-top) tubes
- Temperature
- Room temperature
Immediately after a fasting specimen is obtained, have patient ingest a 75 g load of glucose. Draw subsequent specimens per physician's order. If not specified by the physician, draw specimens 1, 2 and 3 hours later. Label each with the specific draw time. Note: Serum and plasma submissions must be separated from cells
Turnaround
Set up: Mon-Sat; Report available: 3 days
Billing
CPT 82951, 82952