Glucose Tolerance Test, 6 specimens

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

Six - 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, 3, 4 and 5 hours later. Label each with the specific draw time. Serum and plasma submissions must be separated from cells.

Billing

CPT 82951, 82952