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Test Name

Glucose Tolerance Test, 2 Specimens (75g)

CPT Code(s)

82947, 82950

Includes

Fasting, 2-Hour glucose

Methodology

Spectrophotometry (SP)

Limitations

Glucose levels may be depressed if sample is left on clot for an excessive length of time.

Reference Range(s)

American Diabetes Association
Diagnostic Criteria for Diabetes Mellitus
                                     Glucose Value (mg/dL)
Interpretation Fasting 2-Hr Tolerance
Normal <100 <140
Impaired Fasting 100-125  
Impaired Tolerance    140-199
Diabetes ≥126* ≥200*
*Must be confirmed by testing on a subsequent day.

Clinical Significance

This test is used for the routine diagnosis of diabetes in children and the non-pregnant adult. For pregnant females see test "Glucose Tolerance Test, Gestational, 4 Specimens (100 g)". For appropriate interpretation of this test, the patient must fast overnight and ingest a 75 g load of glucose, immediately after, a fasting specimen is obtained. For children, the glucose load is 1.75 g/Kg of ideal body weight, up to 75 g glucose. The diagnosis of diabetes is made if the fasting glucose is ≥126 mg/dL or if the 2-hour specimen is ≥200 mg/dL.

To view specimen requirements and codes please Select a regional laboratory.

Not sure which laboratory serves your office? Call us 866-MYQUEST (866-697-8378)

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided 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 payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

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Glucose Tolerance Test, 2 Specimens (75g)
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