<prompt> LH surge occurs atAt the time of ovulation5-6 days before ovulation24-36 hours before ovulation24 - 72 hours after ovulation  <response>: C. i.e. 24 - 36 hours before ovulation 37-Shaws 14th64-Dutta 4th LH surge precedes ovulation by 24 to 36 hours mean 30 hours and minimum of 75 ngml is required for ovulation 37 - Shaws 14th LH levels remains almost static throughout the cycle except at least 12 hours prior to vulation. When it attains its peak, called LH surge 64 - Dutta 4th The main function of LH is steroidogenic, but along with FSH. It is responsible for full maturation of the graffian follicle and oocyte and ovulation 