Effect of selective screening for gestational diabetes

Area of Science:

• Obstetrics and Gynecology
• Endocrinology
• Public Health

Background:

• Universal screening for gestational diabetes mellitus (GDM) has been standard practice at the University of Michigan Health System since 1987.
• The American Diabetes Association (ADA) revised its recommendations in 1997, suggesting selective screening for GDM based on four low-risk characteristics.

Purpose of the Study:

• To evaluate the impact of the ADA's selective screening recommendations on GDM detection.
• To estimate the percentage of pregnant women who might not be screened for GDM under the new guidelines.
• To determine the proportion of GDM cases that could remain undiagnosed.

Main Methods:

• Analysis of a random sample of 25,118 deliveries at the University of Michigan (1987-1997).
• Assessment of the prevalence of four low-risk characteristics (age < 25, non-high-risk ethnicity, normal weight, no family history) in the obstetric population.
• Evaluation of these characteristics in 200 women diagnosed with GDM.

Main Results:

• Approximately 10-11% of pregnant women met all four low-risk criteria and would not have been screened under ADA guidelines.
• Only 4% of women diagnosed with GDM possessed all four low-risk characteristics, indicating a low miss rate for GDM cases.
• The majority of pregnant women would still require screening.

Conclusions:

• The ADA's selective screening approach for GDM is unlikely to miss a significant number of cases (only 4%).
• However, approximately 90% of pregnant women would still need to be screened, questioning the efficiency of selective screening.
• These findings suggest that universal screening may remain a practical approach for GDM detection.