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Progesterone is the hormone produced by the corpus luteum after ovulation, essential for preparing the uterine lining for embryo implantation and maintaining early pregnancy. A mid-luteal progesterone level confirms whether ovulation actually occurred. Low mid-luteal progesterone is a cause of infertility and recurrent early pregnancy loss.
Also known as: P4, Prog, Progesteron, Progesterona, Progesterone, Progestérone, 프로게스테론, 孕酮
High progesterone in the luteal phase confirms ovulation. Abnormally high can occur with ovarian cysts or congenital adrenal hyperplasia. Low mid-luteal progesterone confirms anovulation.
Follicular phase is normally below 1.0 ng/mL. Mid-luteal optimal is above 10 ng/mL, ideally 15-25 ng/mL. In early pregnancy, above 25 ng/mL is reassuring.