Luteinizing Hormone (LH)

Hormone interaction of FSH, estradiol, LH, and progesterone
When estrogen levels reach a certain point, FSH and LH surge, leading to ovulation. Speck Made / Wikicommons / CC BY / Altered

Definition: LH is a hormone secreted by the pituitary gland. It, along with FSH, helps a woman's egg mature and develop. There is a surge of LH right before ovulation that triggers the egg's release from the ovary, and this surge is what at-home ovulation predictor kits look for.

In men, LH is involved in the production of testosterone, which in turn affects sperm cell growth and development.

More on ovulation and reproduction:

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