What are indications for oral glucose tolerance testing (GTT)?

Updated: May 10, 2021
  • Author: Jiun-Lih Jerry Lin, MBBS, MS(Orth); Chief Editor: Eric B Staros, MD  more...
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Indications for oral GTT include the following:

  • Equivocal fasting plasma/random plasma glucose results

  • To screen for gestational diabetes mellitus at 24–28 weeks of gestation in all pregnant women not known to have diabetes

  • To screen for diabetes mellitus at 6–12 weeks postpartum in women with a history of gestational diabetes mellitus, using nonpregnant oral GTT criteria

  • To screen for impaired glucose tolerance, which is associated with an increased risk of developing diabetes mellitus. [2, 3]

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