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Test Compendium

2052: GLUCOSE, GESTATIONAL, 3 HR CHALLENGE

Test Code

  • 2052

Test Synonym

  • GESTATIONAL GLUCOSE TOLERANCE TEST, GESTATIONAL GTT 3HR

Gender

  • Female

Volume

  • 5 mL (each tube)

Minimum Volume

  • 0.75 mL ( each tube)

Specimen Requirements

  • Plasma / Serum

Container

  • Grey Top Tube Preferred, (Serum Separator Tube acceptable but not preferred due to stability)

Storage

  • Refrigerated

Turn Around Time

  • 1 day

Special Instructions

  • Grey Top Tube For Each Timed Specimen -Indicate If Fasting,1 Hr,2 Hr, 3 Hr

Additional Information

  • 4 TIMED GREY TOP TUBES- F,1 HR,2 HR,3 HR 1. Performed in the morning (between 7 and 9 am) after an 8-14 hour fast. 2. A fasting plasma glucose is measured. 3. A 100 gm glucose load is given orally. 4. Plasma glucose concentration is measured hourly for 3 hours. 5. At least 2 values must exceed the following: Fasting 95 mg/dL 1 hour 180 mg/dL 2 hour 155 mg/dL 3 hour 140 mg/dL 6. If results are normal in a clinically suspect situation, repeat during the third trimester.

Specimen Stability

  • Serum (no hemolysis): 8 hours at 15-25 °C, 72 hours at 2-8 °C, Fluoride plasma: 3 days at 15-25 °C