

Serum progesterone is a test to measures the amount of progesterone in the blood. Progesterone is a hormone produced mainly in the ovaries.
In women, progesterone prepares the uterus for pregnancy and the breasts for milk production. After ovulation, progesterone helps make the uterus ready for implantation of a fertilized egg.
Men produce some amount of progesterone, but it probably has no normal function except to help produce other steroid hormones.
See also: Pregnanediol
Progesterone - serum