Macones et al developed a nomogram for predicting the probability of cesarean section in a primipara. The authors are from Washington University in St. Louis and Saint Louis University.
Patient: primipara
Outcome: probability of cesarean section
Parameters:
(1) age in years (from 14 to 40)
(2) fetal-pelvic index (FPI, from -70 to +30)
(3) race
(4) labor method
points for age =
= (1.065 * (age)) - 14.92
points for fetal-pelvic index =
= (fetal-pelvic index) + 70
Parameter
Finding
Points
race
Black
2
non-Black
0
labor method
spontaneous
0
augmented or induced
12.2
total score =
= SUM(points for all 4 parameters)
Interpretation:
• minimum score: 0
• maximum score: 142
• The higher the score the greater the probability of cesarean section.
