Luteinizing Hormone (LH)
Why this test?
- To assess the functional state of the reproductive system.
- To diagnose infertility.
In what cases is it prescribed?
- For women, when it is difficult to get pregnant or have irregular or heavy periods;
- When tracking ovulation during your menstrual cycle.
- When your partner can't get pregnant or you have low sperm count, low muscle mass or low sex drive (for men).
- When doctor thinks you have pituitary or hypothalamic symptoms.
- When the doctor suspects that the child has delayed or accelerated sexual development.
Luteinizing hormone (LH) is a gonadotropic peptide hormone of the anterior lobe of the pituitary gland that stimulates the secretion of sex hormones (estrogens and progesterone) in men and women. In men, LH affects the Leydig cells of the testes, activating the synthesis of testosterone in them, in women - on the cells of the ovarian membrane and corpus luteum, stimulates ovulation and activates the synthesis of estrogen and progesterone in ovarian cells. In the middle of the menstrual cycle, there is a rise in the level of LH, which is preceded (in 12 hours) by the preovulatory peak of estradiol. Ovulation occurs after 12-20 hours. After reaching the maximum concentration of LH.