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Korean Journal of Obstetrics & Gynecology 1999;42(7):1403-1407.
Published online January 1, 2001.
Influence of Pre-test Diet on Screening Test of Gestational Diabetes.
J Y Cho, J Y Baek
Abstract
OBJECTIVE
This study was performed to investigate the impact of diet on the result of the screening test for gestational diabetes. METHODS: As a screening test, a 50 gm glucose challenge test was done in 1,296 pregnant women between 24th and 28th weeks of gestation. Patients were divided into four groups depending on the diet before the test; 200 Kcal or more within three hours [Group Ia: n=737], less than 200 Kcal within three hours [Group Ib: n=209], fasted for between three hours and less than eight hours [Group II: n=224], fasted for eight hours or more [Group III: n=126]. When the plasma glucose was 130mg/dL or over a 3 hour oral glucose tolerance test [3h-OGTT] was adviced. RESULTS: When the threshold value was 130 mg/dL, the positive rate of screening test was 19.8% of total [Group Ia: 17.6%, Group Ib: 21.1%, Group II: 21.9%, and Group III: 27.0%] and 19.1% of patients other than Group III. The positive rate of Group III was significantly higher than that of Grroup Ia and patients other than Group III [P < 0.05]. Among 257 patients with positive screening test results, 214 patients [83.3%] had 3 hour OGTT. However, the positive rate of 3 h-OGTT was not significantly different among groups; Group Ia [n=109]: 13.8%, Group b [n=34]: 8.8%, Group II [n=46]: 15.2%, Group III [n=25]: 4.0%. CONCLUSION: The screening test of GDM may be bette not to be done in a fasting state for 8 hours or more.
Key Words: screening test, gestational diabetes


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