Luteinizing Hormone (LH) is a hormone produced by the pituitary gland that plays a key role in the regulation of the menstrual cycle and ovulation. It works alongside Follicle-Stimulating Hormone (FSH) to control the reproductive system. Here's a detailed explanation:
Functions of LH in Women
- Ovulation Trigger
- LH surges mid-cycle (around day 14 of a typical 28-day cycle), triggering the release of a mature egg from the dominant ovarian follicle. This is the process of ovulation.
- Corpus Luteum Formation
- After ovulation, LH stimulates the ruptured follicle to transform into the corpus luteum, which produces progesterone.
- Progesterone is critical for preparing the uterine lining (endometrium) for implantation of a fertilized egg.
- Support for Fertility
- LH works in conjunction with FSH to ensure proper development of follicles (egg-containing structures in the ovary).
Normal Range
mIU/L IU/L
19.3-100.6 19.3-100.6