Glucose Tolerance Test

CPT Code(s):

  • 82947
  • 82950

Preferred Specimen:

1 mL plasma from each tube, collected in a fluoride/oxalate (gray-top) tubes

Special Instructions:

Immediately after a fasting specimen is obtained, have patient ingest a specific gram load of glucose. Draw subsequent specimens 1, 2 and/or 3 hours later. Label each with the specific draw time.

Patient Preparation:

Fasting required. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing.

Transport Container:

Room temperature

Specimen Stability Components:

  • Room Temperature: 24 hours

Testing Schedule:


Reference Range:

Anticoagulants other than fluoride/oxalate, hemolysis

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