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Published on: November 13, 2016
Glucose challenge test threshold values in screening for gestational diabetes among black women
Sarah Friedman1, Fady Khoury-Collado, Mudar Dalloul
1Department of Obstetrics and Gynecology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA.
Objective:
The objective of the study was to assess the incidence of gestational diabetes among black women according to various cut-off values of the glucose challenge test.
Study Design:
We performed a retrospective chart review of black patients who had a 50-g, 1-hour glucose challenge test between 24 and 28 weeks' gestation of 130 mg/dL or higher followed by a 100-g, 3-hour glucose tolerance test. Results were categorized in 10-mg/dL increments. Gestational diabetes was diagnosed by 2 or more abnormal values using the Carpenter-Coustan criteria.
Results:
The study included 387 patients. The incidence of gestational diabetes diagnosed overall in all patients with a glucose challenge test of 130 mg/dL or higher was 31.2%. The incidence of gestational diabetes in individuals with a challenge test in the range of 130 to 140 mg/dL was 10.7%. The incidence of gestational diabetes with a screening test of 180 mg/dL or higher was 72.0%.
Conclusion:
Our data support the use of 130 mg/dL as the threshold for a positive glucose challenge test and suggest the use of a glucose tolerance test to confirm the diagnosis of gestational diabetes for screening values up to 200 mg/dL.
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