Gynaecology & Obstetrics Best time to do USG in pregnancy, if it is to be done once in entire pregnancy, would be: March 2011 A 6-8 weeks B 10-12 weeks C 18-22 weeks D 34-36 weeks 💡 Explanation Best time to do USG in pregnancy, if it is to be done once in entire pregnancy, would be: March 2011 ✓ Correct Answer: C. 18-22 weeks