Gynaecology & Obstetrics Smita is a case of infertility. What is the right time in her menstrual cycle to do endometrial biopsy: A 12 -14 days B 17 -19 days C 20 - 22 days D 3 - 5 days 💡 Explanation Smita is a case of infertility. What is the right time in her menstrual cycle to do endometrial biopsy: ✓ Correct Answer: C. 20 - 22 days