Gynaecology & Obstetrics Day 3 serum Estrogen levels to diagnose premature ovarian failure: A <10-20 pg/ ml B <20-40 pg/ ml C <60-80 pg /ml D <40-60 pg /ml 💡 Explanation Day 3 serum Estrogen levels to diagnose premature ovarian failure: ✓ Correct Answer: C. <60-80 pg /ml