Glucose Tolerance Test, 2 Specimens (75g)
What it measures
- Fasting SpecimenLOINC 1558-6
- 2 Hour SpecimenLOINC 1518-0
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 specimen collection.
Specimen
- Specimen
- Two - 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 specimen 2 hours later. Label each specimen with the specific draw time. Note: Serum and plasma submissions must be separated from cells.
Billing
CPT 82947, 82950