Luteinizing hormone 15.63, generally means if it is 15.63IU/ml. is normal during ovulation and if it is high during luteal phase. Generally luteinizing hormone fluctuates at a peak value of 19.18-103.03 IU/ml before ovulation, and in the luteal phase, the normal value of the luteinizing number fluctuates at 1.20-12.86 IU/ml. Luteinizing hormone is one of the gonadotropins secreted by the pituitary gland and helps in follicular development. When the follicle matures and is about to ovulate, a peak of luteinizing hormone develops, which promotes ovulation. During the luteal phase, luteinizing hormone decreases rapidly, which promotes luteinization and maintains luteal function. The normal value of luteinizing hormone not only needs to be combined with the changes in a woman’s menstrual cycle, but also needs to be combined with the changes in her age, just one figure cannot judge whether it is normal or not, if you have any doubts, you can go to the hospital and consult your doctor.