Human Chorionic Gonadotropin (hCG)
Human chorionic gonadotropin (hCG) is a hormone produced by the placenta after the blastocyst attaches itself to the uterus. The hCG is the one being detected in pregnancy strip tests. It also promotes the maintenance of the corpus luteum, the mass of cells forming in the ovary which produces the progesterone, the hormone which promotes pregnancy. HCG levels have been suggested to be associated with morning sickness severity, and is used to induce ovulation.