Dr. Chapa's OBGYN No Spin Podcast

40 to 40.6 EGA as Best Delivery timing?


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In 2018, the ARIVE trial was published in the NEJM revealing that induction of labor at 39 weeks reduced cesarean deliveries and gestational hypertension/preeclampsia in low-risk nulliparous women who had labor induced, compared to expectant management. Then, in 2025, and partly in response to L&D units across the country becoming saturated with low- risk, nulliparous patients awaiting their induction of labors at 39 weeks and 0 days, the ACOG released its clinical practice update in Jan 2025 stating, “The optimal timing of delivery for full-term pregnancies (39 0/7 to 40 6/7 weeks of gestation has not been determined”. Now there is new data, released as an article in press (June 26, 2026), out of the AJOG that raises some interesting questions about potential benefits of induction of labor LATER in the “full term” interval (40- 40 and 6 days) compared to earlier full term (39 weeks to 39 weeks 6 days). These findings are “hypothesis- generating”. Listen in for details.

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1. Grobman WA, Rice MM, Reddy UM, Tita ATN, et al; Eunice Kennedy Shriver National Institute of Child Health and Human Development Maternal–Fetal Medicine Units Network. Labor Induction versus Expectant Management in Low-Risk Nulliparous Women. N Engl J Med. 2018 Aug 9;379(6):513-523.

2. Damri NT, Sheiner E, Wainstock T, Gestational Age at Full-Term Delivery and Long-Term Offspring Morbidity in Low-Risk Pregnancies: A Population-Based Cohort Study, American Journal of Obstetrics and Gynecology (2026),

3. Management of Full-Term Nulliparous Individuals Without a Medical Indication for Delivery: ACOG Clinical Practice Update. Obstet Gynecol. 2025 Jan 1;145(1):e45-e50. doi: 10.1097/AOG.0000000000005783. Epub 2024 Nov 7. PMID: 39513607.

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Dr. Chapa's OBGYN No Spin PodcastBy Hector Chapa

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