Related Experiment Video
Updated: Aug 11, 2026

12:17
The 4-vessel Sampling Approach to Integrative Studies of Human Placental Physiology In Vivo
Published on: August 2, 2017
[Continuous ultrasonic observation on the change of location of placenta in placenta previa]
Zhonghua Fu Chan Ke Za Zhi
|November 1, 1990
Abstract:
Placenta previa was studied in 50 cases during 20-28 weeks of gestation by ultrasonic scanning. The change of location of placenta was monitored continuously for these cases. The rates of change of location to normal sites were 90% for low-lying placenta, 65% for marginal implantation, 13% for partial placenta previa and 11% for central placenta previa. It is suggested that partial or central placenta previa observed during mid-trimester should be categorized as a high risk state.

