Is it normal for the lower margin of the placenta to be greater than 30mm from the internal cervical os?

Patient's question:

No

Doctor's answer:

Hello, under normal circumstances, the lower margin of the placenta should be 40mm away from the internal cervical os. Your condition is classified as placenta previa. There is a certain risk of bleeding, and sexual intercourse is not advisable. Regular prenatal check-ups are recommended, and pay attention to fetal movement.