Induction of Labour in Multiparous Women

Introduction to Induction Options

The American College of Obstetricians and Gynecologists recommends that elective induction at 39 weeks is reasonable for low-risk nulliparous women, but lacks evidence for multiparous women 1, 2, 3

The Society for Maternal-Fetal Medicine states that it is unknown whether the findings of elective induction at 39 weeks can be extrapolated to multiparous women 1, 2
All high-quality evidence supporting elective induction at 39 weeks was conducted exclusively in low-risk nulliparous women 1, 2, 4

The American College of Obstetricians and Gynecologists recommends assessing cervical favorability using the modified Bishop score before selecting an induction method 5, 6
A Bishop score ≥8 indicates a favorable cervix, and oxytocin and/or artificial rupture of membranes can be used 6
A Bishop score <5 indicates an unfavorable cervix, and cervical ripening agents should be used first 5

Elective induction at 39 weeks is associated with reduced cesarean delivery (18.6% vs 22.2%) and reduced hypertensive disorders (9.1% vs 14.1%) in nulliparous women 2, 3
The number needed to treat to prevent one cesarean in nulliparous women is 28 2, 3
Induction is recommended at 41 weeks or later regardless of parity 5

The American College of Obstetricians and Gynecologists recommends never performing elective induction before 39 weeks 0 days, as it is associated with adverse neonatal outcomes including respiratory morbidity 1, 2
Previous uterine surgery is a contraindication to misoprostol 5

The Society for Maternal-Fetal Medicine recommends counseling multiparous women that while induction options are available, the evidence supporting benefits comes from nulliparous women only 1, 2
Expectant management until spontaneous labor or medical indication may be more appropriate for multiparous women given the lack of specific evidence 1, 2

The ARRIVE randomized trial in low‑risk nulliparous women showed that elective induction at 39 weeks reduced cesarean delivery (18.6 % vs 22.2 %) and decreased hypertensive disorders (9.1 % vs 14.1 %) compared with expectant management; however, the study enrolled only first‑time mothers, so its findings cannot be directly applied to multiparous patients. [7][8]

Elective induction before 39 weeks should be avoided because early‑term neonates (37 + 0 to 38 + 6 weeks) have a higher incidence of respiratory morbidity, underscoring the neonatal safety advantage of waiting until at least 39 weeks. 9
At 38 + 4 weeks, a multiparous woman has not yet reached the gestational age at which even nulliparous women demonstrate benefit from induction; therefore, there is no evidence‑based justification for elective induction at this point. 7

Accurate dating using early ultrasonography (ideally before 21 weeks) is essential to prevent inadvertent preterm delivery when scheduling induction, thereby reducing the risk of iatrogenic early‑term birth. [7][9]