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Glucose Fasting (Non-gestational Tolerance Test)
Test Code123530207510
Alias/See Also
GTTFST
Preferred Specimen
Plasma collected in a green-top lithium heparin plasma separator tube (PST)
Patient Preparation
Overnight, 8 hour fast is required. During the test the patient may drink water only. Smoking and eating are prohibited.
Minimum Volume
0.5 mL
Other Acceptable Specimens
Serum collected in a gold-top serum separator tube (SST)
Instructions
1. Obtain a fasting blood specimen.
2. Verify the patient’s fasting blood glucose result by obtaining a drop of whole blood from the Lithium Heparin PST tube or from a finger stick. Test the fasting glucose level using a glucose meter. Proceed as follows.
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A. Glucose between 50-120 mg/dl, proceed with the test.
B. Glucose between 120-150 mg/dl or less than 50 mg/dl, contact attending physician to confirm orders. Document verbal request.
C. Glucose greater than 150 mg/dl, contact attending physician and the pathologist. The pathologist contacts the attending physician if the testing should continue.
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3. After confirming fasting glucose test results, orally administer 75 grams (1 bottle) of glucose solution (glucola) making certain to check the expiration date; if expired, reschedule the test.
4. Obtain blood samples 1 hour and 2 hours later. An additional 3 hour specimen is required for the 3 hour glucose tolerance test.
5. Specimens must be labeled with the hour that the specimen was collected (fasting, first hour, second hour, etc.).
6. Spin and do not separate.
CHILDREN’s GLUCOSE DOSAGE: 1.75 grams of glucose per kilogram (2.2 lbs) of body weight (use Dextrol calculator for glucose test dosage).
2. Verify the patient’s fasting blood glucose result by obtaining a drop of whole blood from the Lithium Heparin PST tube or from a finger stick. Test the fasting glucose level using a glucose meter. Proceed as follows.
****************************************
A. Glucose between 50-120 mg/dl, proceed with the test.
B. Glucose between 120-150 mg/dl or less than 50 mg/dl, contact attending physician to confirm orders. Document verbal request.
C. Glucose greater than 150 mg/dl, contact attending physician and the pathologist. The pathologist contacts the attending physician if the testing should continue.
*******************************************
3. After confirming fasting glucose test results, orally administer 75 grams (1 bottle) of glucose solution (glucola) making certain to check the expiration date; if expired, reschedule the test.
4. Obtain blood samples 1 hour and 2 hours later. An additional 3 hour specimen is required for the 3 hour glucose tolerance test.
5. Specimens must be labeled with the hour that the specimen was collected (fasting, first hour, second hour, etc.).
6. Spin and do not separate.
CHILDREN’s GLUCOSE DOSAGE: 1.75 grams of glucose per kilogram (2.2 lbs) of body weight (use Dextrol calculator for glucose test dosage).
Transport Temperature
Refrigerated
Performing Laboratory
Guthrie Clinic Lab
Corning Hospital Lab
Troy Hospital Lab
GMG Laboratory at Towanda
Cortland Medical Center Lab
