Glucose Tolerance, 3 hour GT3

Method(s) Spectrophotometry
Specimen Required
Collect

One 6 mL gray (sodium fluoride & potassium oxalate) top tube for each specified time.

Transport

1 mL plasma at 20-25°C for each specified time.

Remarks

Patient Preparation: Patient must fast from midnight the night before the test. Patient may drink water during the test. If the patient vomits the glucose solution after ingestion, the test must be discontinued. No food, gum or lozenges may be consumed during the test.

Procedure: Draw fasting blood sample in 1 GREY TOP TUBE and label the blood sample "FASTING".

Administer glucose solution; have the patient drink the entire bottle within 5 minutes.
- Adult Dosage for Men and Non-Gestational Women: 75 grams D-5-Glucose in a flavored drink.
- Dosage for Gestational Women: 100 grams D-5-Glucose in a flavored drink.
- Dosage for Children & Adults Under 95 lbs: Person's weight in kilograms x 0.175 ounce = Number of ounces of 100g D-5-Glucose drink to administer.

NOTE: To obtain weight in kilograms, divide the weight in pounds by 2.2.

Log times for blood draws:
- Draw blood sample 1 hour after ingestion of glucose solution has begun and label this specimen "1 hour".
- Draw the next specimen 2 hours after the ingestion of the glucose solution and label this specimen "2 hour".
- Draw the last blood sample 3 hours after ingestion of glucose solution and label this specimen "3 hour".

Schedule Mon-Fri
Billing Code 1010264
CPTCode 82951, 82952
Notes

This test requires an appointment at one of our Patient Service Centers. Please refer to our Patient Service Center listing for phone number to schedule at referred site.

Https://www.laboratoryalliance.com/patient-services/patient-service-center-finder

Preferred Specimen Collection Device(s)
Reference Interval
NormalImpairedDiabGestational
FastLess than 100110-125100-125Greater than 94
1 HRGreater than 179
2 HRLess than 140140-199Greater than 199Greater than 154
3 HRLess than 110Greater than 139
No Appointment Necessary
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12 Patient Service Centers in Central New York.

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