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Published on June 26, 2024

Gestational GTT Screen (1HR)

Tube Type

Test ID LAB5364
EPIC ORDER GESTATIONAL GTT SCREEN (1HR)
CPT Code(s) 82950
Group/Individual Test Group
Laboratory Core Laboratory
Tube Station Routine 30, STAT 888
Specimen Routine: 3 mL blood/green lithium heparin (gel) tube/gold SST or red plain tubes also acceptable 
Micro: 200 µL blood/green lithium heparin (gel) microtainer/gold SST microtainer tube or red plain tube also acceptable
Availability Routine: 24 hr/day
Turnaround Time             Routine: 2 hrs
  STAT: 1 hr
Reference Range Normal: 1-hour Post Glucola<135 mg/dL
Critical Values <54 mg/dL or >400 mg/dL
Comments
  • This test is for pregnant individuals after administration of 50 g of Glucola and is step one in a two-step process. The test automatically times the collection of one glucose measurement (1-hour Post glucola). If the result is greater than or equal 135 mg/dL, proceed to step two by ordering LAB17001 Gestational GTT Confirmation (0-3 HR) at the next patient encounter.
  • Reference Range Source: Carpenter Coustan Criteria (NIH Consensus) for 2 step GDM screening is endorsed American College of Obstetricians and Gynecologists

Reviewed by J. Carr on November 25, 2025

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514