LH

Luteinizing hormone (LH) is synthesized and secreted by gonadotropes in the anterior lobe of the pituitary gland. Along with the follicle-stimulating hormone (FSH), it is essential for proper reproductive function. In females, an acute rise of LH triggers ovulation; in males, it stimulates Leydig cell production of testosterone. This test typically finds the cause of infertility or irregular or stopped menstrual periods.