Gestational diabetes & diabetes in pregnancy
Effects of a Province-Wide Change in Gestational Diabetes Mellitus Screening Policy on Treatment and Newborn Birth Weight
Authors' conclusion
Changing the screening approach substantially increased diagnoses of lifestyle-treated GDM but did not impact medication-treated GDM or infant birth weight.
Study context
- Population
- Individuals with singleton pregnancies (>28 gestational weeks), British Columbia, Canada, 2004–2019
- Participants
- 463,881 individuals
- Exposure
- After vs before 2010 change in gestational diabetes mellitus (GDM) screening from two-step to a mix of one-step and two-step
- Outcome
- Lifestyle-treated GDM after the screening change
Methodological detailspopulation-based, province-wide
- Population-based
- Province-wide
Main finding
As reported in the abstract
Lifestyle-treated GDM increased immediately after the screening change: level change (95% CI 1.19-2.51), corresponding to a 1.85% increase in incidence
1.85
Observational data: associations, not effects.
Further findings
| Outcome | Trend change (per year) (95% CI) | |
|---|---|---|
| Medication-treated GDMPost-policyvs Pre-policyGradual increase | 0.23 (0.09–0.37) | |
| −0.200.20.4Difference, per year (linear scale) |
| Outcome | Estimate | |
|---|---|---|
| Medication-treated GDM, shorter (3-year) postpolicy periodPost-policyvs Pre-policy | level change −0.31 (95% CI −0.9 to 0.29) | |
| Medication-treated GDM, shorter (3-year) postpolicy periodPost-policyvs Pre-policy | trend change 0.03 (95% CI −0.36 to 0.43) | |
| −1−0.500.5Difference (linear scale) |
Medication-treated GDM, shorter (3-year) postpolicy period
- No change in medication-treated GDM
Infant birth weight (LGA, SGA) and endocrinology visits
- No change detected in infant birth weight outcomes and endocrinology visits
Original publication
Effects of a Province-Wide Change in Gestational Diabetes Mellitus Screening Policy on Treatment and Newborn Birth Weight. Diabetes Care. Published 4 June 2025. doi:10.
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