LH

For males: Luteinizing Hormone (LH) is a pituitary hormone that signals the testes to produce testosterone. It’s used to evaluate low testosterone and fertility—helping distinguish primary testicular problems (often high LH) from pituitary/hypothalamic causes (often low or normal LH).

For females: Luteinizing Hormone (LH) is a pituitary hormone that helps control the menstrual cycle and triggers ovulation (the mid-cycle ‘LH surge’). It’s used in fertility and cycle evaluation, and LH patterns can help assess conditions like PCOS or ovarian dysfunction.