Labor Induction Calculator

Important Information Regarding this Calculator:

This calculator is intended for use among women undergoing a full term (≥37 weeks) induction of labor with an unfavorable cervix (modified Bishop score ≤6 and cervical dilation ≤2cm), singleton gestation, intact membranes, and no prior history of cesarean delivery. The calculator has not been evaluated for use in other populations.

* All fields need to be selected in order to calculate probability of cesarean delivery.

Select maternal height (inches):

< 62" (< 5'2) 62" - 63.9" (5'2 - 5'3.9) 64" - 65.9" (5'4 - 5'5.9) ≥ 66" (≥ 5'6)

Select BMI (kg/m²) at delivery category:

< 25.0 25.0 - 29.9 30.0 - 34.9 35.0 - 39.9 ≥ 40.0

Is the patient nulliparous?

Yes No

Is the gestational age at induction ≥ 40 weeks?

Yes No

Modified Bishop Score prior to induction

Probability of cesarean delivery:

Please see the following paper for suggestions on how this calculator can be used in clinical care : Levine et al. A validated calculator to estimate risk of cesarean after an induction of labor with an unfavorable cervix. Am J Obstet Gynecol 2017 Dec 7. pii: S0002-9378(17)32474-2. doi: 10.1016/j.ajog.2017.11.603. [Epub ahead of print]

Dilation:	<1 cm 1 - 2.5 cm
Effacement/length:	0 - 30% / ≥3 cm 40 - 50% / 2 cm 60 - 70% / 1 cm ≥80% / <1 cm
Station:	-3 -2 -1, 0 +1, +2
Calculated modified Bishop Score: