Differences between LH surge and FSH surge

LH SURGE:

• It controls the second half of menstrual cycle i.e., the luteal phase.
• It sustains development of corpus leuteum and its secretory activity.
• Usually around the midpoint of the cycle, LH secretion surges to really high levels. The hormone surge triggers ovulation about 24 to 36 hours later.
• It occurs in the middle of menstrual cycle.
• LH acts on Leydig cells to produce androgens.
• It causes ovulation.
• LH comes into play once the egg is mature inside the follicle.
• LH does not stimulate secretion of estrogen.
• LH deficiencies may be indicated by low level of progesterone in female. Indicated by excessive bleeding during cycles, insomnia.

FSH SURGE:

• It controls the first half of menstrual cycle i.e., the follicular phase.
• It does not act on corpus luteum.
• The FSH surge recruits ovarian follicles (Graafian follicles) for entry into the menstrual cycle.
• It begins to rise in last few days of menstrual cycle and is highest during first week of follicular phase.
• It does not produce androgens.
• It does not cause ovulation.
• FSH helps in maturing of egg inside the follicle.
• It stimulates the secretion of estrogen.
• FSH deficiency causes low level of LH in human body. May cause infertility and lack of monthly cycles in female.