External Cephalic Version (ECV) Success Calculator
Clean clinical workflow: adjust inputs, review the live predicted probability, then use the interpretation, checklist, and EMR-ready summary.
Inputs
Dahl et al. (2021) validated four-variable model.
Current BMI: 27.0
Nulliparous
Multiparous
Breech
Transverse / Oblique
Not anterior
Anterior placenta
Try quick scenarios
Counseling aid only. This tool does not determine candidacy and does not replace contraindication review, fetal assessment, or shared decision-making.
Estimated ECV success probability
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Awaiting calculation
LowerIntermediateHigher
Original cohort success 40.6%; external validation AUROC 0.70.
Interpretation
Factors affecting probability
Clinical workflow
Reassuring fetal status
Presentation reconfirmed
Placental location reviewed
Amniotic fluid assessed
Risks / consent reviewed
Urgent delivery capability
EMR-ready impression
Live documentation summary will appear here.
Advanced / teaching mode
Print-friendly counseling summary
Live print summary will appear here.
Procedure risk reminder
In the derivation study, complications leading to unanticipated delivery within 24 hours occurred in 6.7% of cases; persistent nonreassuring fetal status leading to delivery occurred in 4.8%, placental abruption in 1.6%, labor in 1.0%, spontaneous rupture of membranes in 0.6%, cord prolapse in 0.1%, and emergency cesarean delivery in 2.6%.
Methodology
Equation used p = 1 / (1 + e−x) where x = 1.1726 − 0.0314(BMI) − 0.9299(nulliparity) + 1.0218(transverse/oblique presentation) − 0.5113(anterior placenta).
Use Designed as a counseling aid rather than a strict threshold for or against ECV.
References Dahl et al. 2021; external validation by Kishkovich et al. 2023; older scoring model Newman et al. 1993.