Days Set Up
Daily, 24 hours
Analytic Time

2 hours

MiChart Code
3HR Glucose Tolerance
Soft Order Code
GLUC3

Test Updated:

Synonyms

GLUC3
OGTT
3 Hour Gluocose Tolerance

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All specimens should be accompanied by a requisition.

Submitting Specimens

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MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

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Test Overview

Test Methodology

Hexokinase, NADH Endpoint

Test Usage

Determine glucose level, monitor insulin therapy, evaluate carbohydrate metabolism.

Reference Range

Fasting <95 mg/dL; 1 hr <180 mg/dL; 2 hr <155 mg/dL; 3 hr <140 mg/dL. A positive diagnosis results from a fasting value equal to or above 95 mg/dL or any two or more values that are equaled or exceeded.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

Collect blood in an SST tube from a fasting patient. Administer 100 gm Glucola. Instruct patient to finish drinking the Glucola within 5 minutes of the time he or she starts drinking and not to eat anything except a few sips of water after finishing the Glucola. The patient should remain seated and not smoke throughout the test. Collect blood in an SST tube exactly 1, 2 and 3 hours after the patient finished drinking the Glucola. Centrifuge, aliquot serum into plastic vials and refrigerate. Label vials appropriately (Fasting, 1 HR, 2 HR, and 3HR).

Collection Offsite

Collect blood in an SST tube from a fasting patient. Administer 100 gm Glucola. Instruct patient to finish drinking the Glucola within 5 minutes of the time he or she starts drinking and not to eat anything except a few sips of water after finishing the Glucola. Collect blood in an SST tube exactly 1, 2, and 3 hours after the patient finished drinking the Glucola. Centrifuge within 4 hours of collection, aliquot serum into a plastic vial and refrigerate. If specimen cannot be centrifuged at client site, please arrange for delivery to MLabs within 3 hours of specimen collection. Label vials appropriately (Fasting, 1 HR, 2 HR, and 3HR).

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.25 mL serum

Billing Information

CPT Code
82951
Pro Fee Code
 
LOINC
 

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.