Gynaecology & Obstetrics Low-lying placenta is when the edge of placenta is __________ A <2cm away from the internal os B >2.5 cm away from the internal os C >2 cm away from the internal os D <2.5 cm away from the internal os 💡 Explanation Low-lying placenta is when the edge of placenta is __________ ✓ Correct Answer: A. <2cm away from the internal os