Selective rather than universal screening for gestational diabetes mellitus?

Area of Science:

• Obstetrics and Gynecology
• Endocrinology
• Public Health

Background:

• Gestational diabetes mellitus (GDM) affects pregnancy outcomes.
• Current screening strategies for GDM vary, impacting detection rates.
• Identifying optimal screening methods is crucial for maternal and fetal health.

Purpose of the Study:

• To determine the proportion of GDM cases missed by selective screening.
• To compare pregnancy outcomes between women with and without GDM risk factors.
• To evaluate the effectiveness of universal versus selective GDM screening.

Main Methods:

• An observational cohort study involving universal screening for GDM using a 75g oral glucose challenge test (OGTT).
• Risk factors for GDM included advanced maternal age, obesity, family history, and previous GDM or macrosomia.
• Outcomes assessed were large for gestational age (LGA) and small for gestational age (SGA).

Main Results:

• 14% of screened women had GDM; 83% of these had at least one risk factor.
• 2.4% of women with GDM had no identifiable risk factors, representing one-sixth of all GDM cases.
• GDM cases without risk factors had lower fasting blood glucose and less need for insulin compared to those with risk factors.

Conclusions:

• Selective screening would miss a significant proportion of GDM cases.
• GDM cases identified without risk factors appear milder with potentially fewer complications.
• An opt-out screening approach may be considered for low-risk women to avoid unnecessary tests.