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Related Experiment Videos

Does fasting interval affect the glucose challenge test?

M D Berkus1, M P Stern, B D Mitchell

  • 1Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio 78284-7836.

American Journal of Obstetrics and Gynecology
|December 1, 1990
PubMed
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Fasting interval impacts insulin response during glucose challenge tests in pregnant patients. Shorter fasting periods (<3 hours) significantly increase insulin levels, potentially affecting screening accuracy, especially in obese individuals.

Area of Science:

  • Endocrinology
  • Obstetrics
  • Metabolic Disorders

Background:

  • Glucose challenge tests (GCT) are standard for gestational diabetes screening.
  • Fasting duration's effect on GCT insulin response is not fully understood.
  • Insulin resistance and secretion dynamics are crucial in pregnancy.

Purpose of the Study:

  • To investigate the influence of fasting interval on insulin response during GCT.
  • To assess how fasting duration affects insulin/glucose index in pregnant patients.
  • To determine if fasting interval modifies GCT results, particularly in obese or high-risk pregnancies.

Main Methods:

  • Prospective study of 153 non-diabetic pregnant patients.
  • Standard 50g oral glucose challenge test administered.

Related Experiment Videos

  • Analysis of plasma glucose and insulin levels based on fasting interval (<3 hours vs. >3 hours).

    • Main Results:

    • Fasting <3 hours significantly increased insulin response (121.3 vs. 83.5 pmol/l) and insulin/glucose index (0.92 vs. 0.66) compared to >3 hours.
    • Plasma glucose levels showed no significant difference based on fasting interval.
    • Obese patients with >3 hours fasting showed higher insulin levels (107 vs. 69 pmol/l) and index (0.79 vs. 0.59).

    Conclusions:

    • Fasting interval duration significantly influences insulin secretion during GCT.
    • Aberrant insulin response due to short fasting may affect GCT screening accuracy.
    • Consideration of fasting interval is important for interpreting GCT results, especially in high-risk pregnancies.