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Technical Update No. 467: Progesterone for Previous Spontaneous Preterm Birth.

Venu Jain1, Sarah D McDonald2, Dan Farine3

  • 1Edmonton, AB.

Journal of Obstetrics and Gynaecology Canada : JOGC = Journal D'Obstetrique Et Gynecologie Du Canada : JOGC
|March 19, 2026
PubMed
Summary
This summary is machine-generated.

Progesterone therapy can reduce spontaneous preterm birth in certain high-risk pregnant women. While generally safe, its effectiveness varies, and it involves some discomfort and cost.

Keywords:
administrationcervical length measurementintravaginalobstetric laborpregnancy complicationspregnancy outcomeprematurepremature birthprogesterone

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Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Neonatal Health

Background:

  • Spontaneous preterm birth (SPB) poses significant risks to neonatal morbidity and mortality.
  • Identifying effective interventions to prevent SPB is a critical area of obstetric research.
  • Previous spontaneous preterm birth is a primary risk factor for recurrence.

Purpose of the Study:

  • To evaluate the efficacy and safety of progesterone therapy for preventing spontaneous preterm birth.
  • To assess the impact of progesterone on neonatal and postnatal outcomes.
  • To provide evidence-based recommendations for progesterone use in high-risk pregnancies.

Main Methods:

  • Systematic review of evidence from major medical databases (Medline, PubMed, EMBASE, Cochrane Library).
  • Focus on pregnant women with a history of spontaneous preterm birth.
  • Evaluation of progesterone administration versus withholding therapy.
  • Assessment of outcomes including preterm birth, neonatal complications, and neurodevelopmental status.
  • Quality of evidence and strength of recommendations assessed using the GRADE approach.

Main Results:

  • Progesterone therapy demonstrated a significant reduction in spontaneous preterm birth risk in specific subpopulations.
  • The therapy is associated with costs and discomfort for the patient.
  • No significant adverse effects were identified for the mother or the newborn.

Conclusions:

  • Progesterone therapy is beneficial for selected women at increased risk of spontaneous preterm birth.
  • Recommendations support its use in women with a short cervix (≤25 mm) between 16-24 weeks gestation.
  • It is not recommended for women with a history of SPB and normal cervical length.