How long does the corpus luteum survive?
After a woman ovulates, the corpus luteum only lasts for about 12-14 days unless it begins receiving HCG (human chorionic gonadotropin) from a developing embryo. If the egg is not fertilized, the corpus luteum dies and progesterone production stops. When progesterone levels drop, the uterus lining stops thickening and is consequently shed during menstruation. If the egg is fertilized, the corpus luteum will begin receiving HCG from the embryo. HCG tells the corpus luteum to keep producing progesterone. The corpus luteum lasts for about ten weeks after ovulation. After ten weeks the placenta takes over progesterone production through the end of pregnancy.
