Is a distance of 30 mm between the lower edge of the placenta and the internal cervical os considered low?

The distance of 30 mm between the lower edge of the placenta and the internal cervical os is considered relatively low.

Under normal circumstances, the distance between the lower edge of the placenta and the internal cervical os should exceed 70 mm. A measurement of 30 mm is significantly below the normal range and indicates a low-lying placenta (placenta previa). Low-lying placenta is one type of placenta previa. Currently, there are no specific clinical treatments available; however, in some women, the placenta may naturally move upward before 30 weeks of gestation. Pregnant women with a low-lying placenta are advised to get adequate rest, avoid excessive fatigue, minimize prolonged standing or urine retention, and strictly abstain from sexual intercourse to help prevent threatened miscarriage or preterm labor.

If a woman with a low-lying placenta experiences painless vaginal bleeding or similar symptoms, she should seek medical attention promptly for fetal protection. In cases of heavy bleeding, immediate consideration should be given to terminating the pregnancy.