Low-implanted placenta

This condition is common in early pregnancy, the placenta is implanted onto the lower uterine segment; but, generally, after a few months, it reascends and occupies the upper part of the uterus. This is why low insertion of the placenta can only be suspected on ultrasonography after the first trimester. Until then, it is not in its definitive position inside the uterus.

Contractions of the uterus, even weak, can detach the lower border of the placenta and cause minor bleeding.

This is not serious but requires rest, medical therapy and strict monitoring with ultrasonography. In over 90% of cases, a low-implanted placenta ascends as the uterus grows into the uterine cavity and does not cause any further problems. If unfortunately the placenta is implanted in the lower uterine segment near the cervix, and even more so if it "covers over" the internal os, this requires absolute bed rest and prolonged hospitalisation of the mother in late pregnancy, because of possible bleeding. A cesarean section may sometimes be necessary.