Glucose Tolerance, 2 hour GT2

Method(s) Spectrophotometry, Dipstick
Specimen Required
Collect

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

Transport

1 mL plasma at 2-8ºC 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 final specimen 2 hours after the ingestion of the glucose solution.

Schedule Mon-Fri
Billing Code 1010263
CPTCode 82951
Notes

For non-gestational patients, this test includes a fasting urine screen for glucose and is therefore only collected in designated Patient Service Centers and needs to be scheduled in advance. Please call Customer Service at 315-461-3008 for a list of locations.

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

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