Q: What are my odds that I will have a placenta previa an accreta or another placental anomaly?

A: Here are your chances:

• 1 in 20 patients have a placenta previa at 20 weeks
• 1 in 200 patients have a placenta previa at term
• So consequently 9 out of 10 who have a placenta previa at 20 weeks will NOT have it anymore at term
• You have a 1 in 1,000 chance to have a placenta previa if this is your first pregnancy
• Up to 1 in 20 to have a placenta previa if you had a child before
• Up to 1 in 12 to have a Previa if you had one before
• 1 in 50 to have a Previa if you are over 35
• 1 in 35 to have a Previa if you are over 40
• 1 in 4 that you have a placenta accreta if you have a placenta previa and one prior cesarean section
• 1 in 2 that you have a placenta accreta if you have a placenta previa with 2+ prior cesarean sections
• 1 in 3000 to have a vasa previa
• 1 in 120 to have an abruptio placentae
• 1 in 12 to have another abruptio placentae
• 1 in 4 to have a third abruptio placentae