VBAC Risk Score for Successful Vaginal Delivery (Flamm Model)

Calculators

Maternal age < 40 years

No 0

Yes 2

Vaginal birth history

Vaginal birth before and after first cesarean delivery 4

Vaginal birth after first cesarean delivery 2

Vaginal birth before cesarean delivery 1

No previous vaginal birth 0

Reason other than failure to progress for first cesarean delivery

No 0

Yes 1

Cervical effacement at admission

> 75% 2

25-75% 1

< 25% 0

Cervical dilation ≥ 4 cm at admission

No 0

Yes 1

Result:

Background

Ranges Ranges