Gynaecology & Obstetrics Disorders of menstruation 4dffa19d Peak level of LH required for ovulation: A 15 ng/ml B 50ng/ml C 30ng/ml D 75ng/ml High-Yield Explanation Peak level of LH required for ovulation is 75 ng/ml It lasts for 24 hrs Ref: Shaw Gynecology 17 e pg 40.