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Vanderbilt Pathology Laboratory Services

Test Directory



GLUCOSE TOLERANCE 100 G (DIAGNOSTIC) FOR GESTATIONAL DIABETES (GT1)

Department: Chemistry
Test Synonym(s): GT1
CPT Codes: 82951, 82952
Methodology: Colorimetric
Reference Range: Gestational Diabetes diagnosed if at least 2 values exceed the following cut-offs: Baseline: none - 95, 1 hour: none - 180, 2 hours: none - 155, 3 hours: none - 140
Tube Type: Grey top - 5 mL, Performed following 100 g Glucola ingestion if screening GTT is abnormal. Overnight fasting is required.
Specimen: Blood
Pediatric Requirements: 2 microtainers
Volume: 2 mL
Minimum Volume: 0.7 mL for each specimen
Days Performed: Daily
Times Performed: Continuous
Significance: Diagnostic of Gestational Diabetes.
Special Instructions: Must show collection time. Draw serum glucose at fasting, 60, 120 and 180 minutes post-oral Glucose load. Label tubes as: fasting, 60, 120 and 180 minutes collection, respectively.

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