COVID-19: Vaccine information, visitor restrictions, and additional resources | Medicaid: The program is changing and you must take steps to keep your UNC Health providers

O'Sullivan 1 Hour Glucose (Obstetric Screen)

Tube Type


Test ID LAB5364
EPIC Order
CPT Code(s) 82950
Group/Individual Test Individual
Laboratory Core Laboratory
Tube Station Routine: 30, STAT: 888
Specimen Routine: 3 mL blood/serum separator tube/gold top/red top acceptable
micro: 200 µL blood/serum separator bullet/red top
Availability 24 hr/day
Turnaround Time STAT 1 hr; Routine 2 hrs
Reference Range Normal: <135 mg/dL; see Comments for additional information
Critical: <40 mg/dL or >400 mg/dL
This test does not include a fasting glucose. The normal range is based on 50 gm glucose load in non-fasting state at 24-28 weeks gestation.
For results >135 mg/dL, please consult the most recent OB-GYN recommendations.
Source: 1. ACOG Practice Bulletin #137. Obstet Gynecol2013: 122:406-16.
           2. VanDorsten JP et. al. Diagnosing gestational diabetes. NIH Consensus Development Conference Statement 2013;29(1):1-30.

Reviewed by D. Burton on December 16, 2019

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

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