Gynaecology & Obstetrics Ovulation is presumed to have occurred if progesterone level is __________ on day 21 A 0.3 ng / mL B 3 ng / mL C 30 ng / mL D 300ng / mL 💡 Explanation Ovulation is presumed to have occurred if progesterone level is __________ on day 21 ✓ Correct Answer: B. 3 ng / mL