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Vanderbilt Pathology Laboratory Services

Test Directory



GLUCOSE TOLERANCE 75 G TEST (GT7)

Department: Chemistry
Test Synonym(s): GT7
CPT Codes: 82951
Methodology: Colorimetric
Reference Range: Fasting Glucose: 95 mg/dL - normal, 110-126 mg/dL - impaired Glucose tolerance, >126 mg/dL - Diabetes. 2-hour Glucose: <140 mg/dL - normal,. 140-200 mg/dL - impaired Glucose tolerance, >200 mg/dL - Diabetes.
Tube Type: Grey top - 5 mL, Performed following 75 g (Adult) or 1.75 g/kg (Peds) Glucola ingestion.
Specimen: Blood
Pediatric Requirements: 2 microtainers
Volume: 3 mL plasma
Minimum Volume: 0.7 mL plasma
Days Performed: Daily
Times Performed: Continuous
Significance: Diagnostic of impaired Glucose Tolerance and Diabetes.
Special Instructions: Must show collection time. Draw samples at fasting and 120 minutes after oral Glucose load. Label tubes as fasting and 120 minutes collection. Indicate time of collection on tube and requisition.

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