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The usual term placenta is about 22 cm in diameter and 2.0 to 2.5 cm thick. It generally weighs approximately 470 g (about 1 lb). However, the measurements can vary considerably, and placentas generally are not weighed in the delivery room.
Who is at risk for placenta previa? Placenta previa is found in approximately four out of every 1000 pregnancies beyond the 20th week of gestation. Asian women are at a slightly greater risk for placenta previa than are women of other ethnic groups, although the reason for this is unclear.