What does it mean when the lower edge of the placenta covers the internal cervical os?

Apr 26, 2023 Source: Cainiu Health

Dr. Lv Aiming

Introduction

The lower edge of the placenta covers the internal cervical os, meaning the placenta is attached to the lower segment of the uterus. When the lower edge reaches the cervical opening but does not extend beyond it, it is referred to as marginal placenta previa. This type of placenta may cause bleeding in the late stages of pregnancy and should be taken seriously. In daily life, when marginal placenta previa is present, avoid strenuous activities such as running or jumping.

The lower edge of the placenta covers the internal cervical os, meaning that the placenta is attached to the lower segment of the uterus. When the lower edge reaches the edge of the cervical opening but does not extend beyond it, it is referred to as marginal placenta previa. This type of placenta may cause bleeding in late pregnancy and should be taken seriously. The detailed explanation is as follows:

Under normal circumstances, the placenta should be located on the anterior, posterior, lateral walls or fundus of the uterus—this is considered the normal placental position, meaning the placenta should be positioned higher than the fetus. When the lower edge of the placenta covers the internal cervical os and its position is lower than that of the fetus in cases of marginal placenta previa, during the second or third trimester, uterine contractions can cause separation of the placenta from its attachment site at the cervix, leading to vaginal bleeding. If vaginal bleeding occurs, immediate hospitalization is required.

In daily life, when marginal placenta previa is diagnosed, avoid strenuous activities such as running or jumping, and do not squat. Squatting may stretch the placenta, cause cervical dilation, and potentially lead to bleeding. Regular prenatal checkups are essential. If any bleeding, recurrent bleeding, or excessive bleeding occurs, seek medical attention immediately.

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