Laboratory

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Test Panels
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GLUCOSE
Alternate Names:	None
Performed:	Daily, 24 Hours
Methodology:	Colorimetric
Turnaround Time:	Not applicable
Container / Specimen Requirements
Container / Tube:	Yellow serum separator Vacutainer® tube
	or Green Vacutainer® tube (lithium heparin) or
	Red Vacutainer® tube.
Minimum Volumes:	1 ml
Special Handling or Timing of Specimen:
1 Hour GTT	Blood is collected 60 minutes after the subject completes drinking the glucose tolerance beverage.
2 Hour GTT	Blood is collected as fasting, 0.5, 1, 1.5, and 2 hour specimens.
3 Hour GTT	Blood is collected as fasting, 1, 2, and 3 hour specimens.
Preparation of Patient:	Patient must be fasting for at least 10 hours but not more than 12 hours preceding the test. Patient should avoid coffee, smoking and unusual physical activity for at least 8 hours prior to the test. Patient should not smoke during the test. Water is allowed. Patient must drink the glucose tolerance beverage within 5 minutes.
Patients are dosed according to the following rules:
1 Hour GTT	150 mL Dextrol beverage. 1/2 bottle = 50 grams glucose.
2 Hour GTT	All non-pregnant patients: 225 mL Dextrol beverage. ¾ bottle = 75 grams glucose
3 Hour GTT	Pregnant patients: 300 mL Dextrol beverage. One full bottle = 100 grams glucose. Non-pregnant patients: 225 mL Dextrol beverage. ¾ bottle = 75 grams glucose.
Reference Range
1 Hour GTT	For a 50-gram oral glucose tolerance test (150mL Dextrol) used to screen for gestational diabetes, normal blood values at 1 hour are less than 140 mg/dL.
2 Hour GTT	For a 75-gram oral glucose tolerance test (225mL Dextrol) used to check for type 2 diabetes, normal (non-diabetic) blood values are: · Fasting: 60 to 110 mg/dL (adults) · Fasting: 60 to 130 mg/dL (children) · ½ hour: less than 200 mg/dL · 1 hour: less than 200 mg/dL · 1 1/2 hour: less than 200 mg/dL · 2 hours: less than 140 mg/dL. Note: Children less than 16 years of age are dosed according to their weight.
3 Hour GTT	For a 100-gram oral glucose tolerance test (300 mL Dextrol) used to screen for gestational diabetes, normal blood values are: · Fasting: less than 95 mg/dL · 1 hour: less than 180 mg/dL · 2 hour: less than 155 mg/dL · 3 hour: less than 140 mg/dL For a 75 gram oral glucose tolerance test (225mL Dextrol) used to check for diabetes. · Fasting: 60 to 110 mg/dL · 1 hour: less than 200 mg/dL · 2 hours: less than 140 mg/dL. · 3 hours: less than 140 mg/dL
Causes for Specimen Rejection:	Improper labeling, patient not fasting, and/or hemolysis.
CareManager Test Group: CareManager Name/Alias:	LAB glucose
Specimen Labeling:	Click here for policy

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