Individual tests

PTH is a hormone your parathyroid glands make, which helps control the calcium level in your blood. If calcium blood levels are too low, your parathyroid glands will release PTH to raise calcium levels. If calcium levels are too high, these glands will stop making PTH. This test helps diagnose hyperparathyroidism (too much PTH) and hypoparathyroidism (too little PTH), monitor kidney disease, and determine whether high calcium blood levels relate to parathyroid glands.
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.
Progesterone is a hormone from the ovaries. During a normal menstrual cycle, progesterone prepares your uterus for pregnancy. This test is useful for those having trouble getting pregnant, undergoing fertility treatment, or experiencing abnormal bleeding when not pregnant.
Prolactin is a pituitary gland hormone that causes the breasts to grow and produce milk. If prolactin levels are higher than normal, it often means there is a type of tumor of the pituitary gland. This test is often used to diagnose a prolactinoma, find the cause of a woman's menstrual irregularities and/or infertility, or determine the reason for a man's low sex drive and/or erectile dysfunction.
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