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OpenMFM · Bedside Counseling Tool

External Cephalic Version Success Calculator

Estimates the probability of successful ECV using the validated four-variable Dahl et al. (2021) logistic model. Intended as a counseling aid for shared decision-making, not a threshold for offering or withholding the procedure.

Step 1 · Contraindication Screen

Check any that apply. This list reflects ACOG Practice Bulletin No. 221 and current literature on ECV risk. It is a screening aid, not a complete substitute for clinical judgment — individualize as needed.

Absolute contraindications — ECV should not proceed
Relative contraindications — individualize, counsel carefully

ECV not recommended based on this screen

The following absolute contraindication(s) were selected. The success calculator below has been disabled because a probability estimate is not clinically meaningful when the procedure itself should not be attempted.

Relative contraindication(s) noted. The calculator below remains available, but individualize the decision to attempt ECV and counsel the patient accordingly.

Step 2 · Patient & Pregnancy Factors

Estimated ECV Success Probability
 
Lower  ·  Intermediate  ·  Higher  —  original derivation cohort success rate 40.6%
BMI
Parity
Presentation
Placenta