VBAC Scoring
Info
Age <40 years Yes No
Vaginal Birth History Before & After 1st Cesarean After 1st Cesarean Before 1st Cesarean None
Reason other than failure to progress for first Cesarean Yes No
Cervical effacement at admission >75% 25-75% <25%
Cervical dilation >=4 cm at admission Yes No
R e s u l t s
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Score
 
Show Results
Info
VBAC Scoring

Cesarean delivery is the most commonly performed major operation in the United States.  Many of these are repeat Cesarean deliveries.

 

Vaginal Birth After Cesarean (VBAC) is a safe option, in many cases; however, complications are present, especially in those women who have an unsuccessful VBAC attempt.

 

This prediction rule, based upon 5022 VBAC patients, can assist in the determination of which women are likely or unlikely to have a successful trial of labor.

 

The items found to affect successful VBAC were:

  • Age <40 years [2 pts]
  • Vaginal Birth History
    • Before & After 1st Cesarean [4 pts]
    • After 1st Cesarean [2 pts]
    • Before 1 st Cesarean [1 pt]
    • None [0 pts]
  • Reason other than failure to progress for first Cesarean [1 pt]
  • Cervical effacement at admission
    • >75% [2 pts]
    • 25-75% [1 pt]
    • <25% [0 pts]
  • Cervical dilation >=4 cm at admission [1 pt]

 

The points are added together for each of these 5 items.

 

Total Score VBAC % Successful
0-2 49.1%
3 59.9%
4 66.7%
5 77.0%
6 88.6%
7 92.6%
8-10 94.9%

 

Reference:

Flamm BL, Geiger AM. Vaginal Birth After Cesarean Delivery: An Admission Scoring System. Obstet Gynecol. 1997;90:907-10.