Likelihood of Placenta Previa Continuing to Term According to Dashe et al

Dashe et al evaluated pregnant women with placenta previa. They predicted the chances of the condition lasting until term.

Parameters:

(1) type of placenta previa (partial or complete)

(2) history of cesarean delivery

(3) week of gestation when previa detected on ultrasound

Type of Preview	History of Cesarean Delivery	Week of Gestation	Percent Persisting to Term
partial	no	15 to 19 weeks	6%
		24 to 27 weeks	12%
		32 to 35 weeks	39%
partial	yes	15 to 19 weeks	7%
		24 to 27 weeks	40%
		32 to 35 weeks	63%
complete	no	15 to 19 weeks	20%
		24 to 27 weeks	56%
		32 to 35 weeks	90%
complete	yes	15 to 19 weeks	41%
		24 to 27 weeks	84%
		32 to 35 weeks	89%

A woman with persistent placenta previa during the third trimester should take precautions (avoiding intercourse, not use tampons) to avoid bleeding.

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