Question

About which day in a normal human menstrual cycle does rapid secretion of LH (called as LH-surge) normally occurs?

• A. ${14}^{th}$ day
• B. ${20}^{th}$ day
• C. $5^{th}$ day
• D. ${11}^{th}$ day

Answer 1

Answer: (A)

${14}^{th}$ day

Ovulation is the second phase of the ovarian cycle in which a mature egg is released from the ovarian follicles into the oviduct. When the egg has nearly matured, levels of estradiol reach a threshold above, which this effect is reversed and estrogen stimulates the production of a large amount of LH. This process is known as the LH surge, starts around day 12 - 13 of the average cycle and may last 48 hours. Hence, option A is correct.