Glucose Tolerance 75G (GT7)

Department: Chemistry
Test Synonym(s): LAB169, GT7, Diabetes
CPT Codes: 82951
Methodology: Enzymatic (Hexokinase/G-6-PDH)
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. Overnight fasting is required.
Specimen: Plasma
Pediatric Requirements: 1 light green top microtainer
Volume: 3 mL plasma
Minimum Volume: 1 grey top (Pediactric = 1 light green top microtainer)
Temperature: Separate within one hour and store at 2-8C until delivery
Stability: Refrigerated: 3 days; Frozen: 6 months
Reasons for Rejection: Hemolysis, improper collection
Days Performed: Daily
Times Performed: Continuous
TAT: STAT: 1 hour; ROUTINE: 2 hours after receiving in lab
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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