Glucose Tolerance Test, Postprandial/2-Hour : 4637

Test Code

GPC2AU or 4637

CPT Codes
82947

Instructions

Specimen is obtained 2 hours following a meal. Serum and plasma submissions must be separated from cells.

Transport Container

Preferred Specimen
1 mL plasma collected in a fluoride/oxalate (gray-top) tube

Alternative Specimens
Plasma from fluoride/oxalate (gray-top), lithium heparin (green-top) or sodium heparin (green-top) tube in a plastic screw-cap vial, Serum (separated from cells immediately) in a plastic screw-cap vial, Spun SST®

Minimum Volume
0.5 mL

Transport Temperature

Room temperature.

Specimen Stability

Serum
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days

Whole blood (gray-top) tube
Room temperature: 24 hours
Refrigerated: 72 hours
Frozen: Unacceptable

Sodium fluoride plasma
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days

Heparinized plasma
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Unspun serum or plasma separator tube (SST® or PST), Red-top or green-top tube (serum or heparinized plasma not separated from cells), Anticoagulants other than lithium heparin, sodium heparin or fluoride/oxalate

Methodology
Spectrophotometry

Setup Schedule

Sunday - Saturday

Report Available

1 day

Reference Range

<140 mg/dL

Clinical Significance

Postprandial glucose levels may be abnormally high in patients with gestational diabetes. If results are positive, and the patient is pregnant, a 3-hour oral glucose tolerance test should be performed for confirmation of gestational diabetes.

Performing Laboratory
med fusion

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.