Placenta previa risk factors

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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Risk factors

The following have been identified as risk factors for placenta praevia:

• Previous placenta praevia, caesarean delivery, orabortion.
• Women who have had previous pregnancies, especially a large number of closely spaced pregnancies, are at higher risk.
• Women who are younger than 20 are at higher risk and women older than 30 are at increasing risk as they get older.
• Women with a large placentae from twins or erythroblastosis are at higher risk.
• Women who smoke or use cocaine may be at higher risk.
• Race is a controversial risk factor, with some studies finding minorities at higher risk and others finding no difference.