title: Glucose challenge test threshold values in screening for gestational diabetes among black women.
abstract: 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.
  
  
  METHODS
  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%.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Obstetrics and Gynecology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA.
authors.forename: Sarah
authors.initials: S
authors.lastname: Friedman
authors.forename: Fady
authors.initials: F
authors.lastname: Khoury-Collado
authors.forename: Mudar
authors.initials: M
authors.lastname: Dalloul
authors.forename: David M
authors.initials: DM
authors.lastname: Sherer
authors.forename: Ovadia
authors.initials: O
authors.lastname: Abulafia
mesh_terms: D000328:Adult; D044383:Black People / Q000706:statistics & numerical data*; D016640:Diabetes, Gestational / Q000175:diagnosis* / Q000453:epidemiology*; D004056:Differential Threshold; D005260:Female; D005947:Glucose; D006801:Humans; D015994:Incidence; D008403:Mass Screening / Q000379:methods* / Q000592:standards; D011247:Pregnancy
chemical_list: D005947:Glucose