Luteinizing Hormone (LH)
Luteinizing hormone (LH) is a reproductive hormone which works with the follicle stimulating hormone (FSH) produced by the pituitary gland. In women, its functions include triggering ovulation and developing the corpus luteum, the mass of cells forming in the ovary which produces the progesterone, the hormone which promotes pregnancy. In men, it is associated with the production of testosterone, a primary male sex hormone. Physicians may order LH tests as a part of infertility workup or to check pituitary gland conditions.