BETA HUMAN CHROIONIC GONDOTROPIN(HCG)
During pregnancy, cells in the developing placenta make hCG. The placenta is the sac that nourishes the egg after it’s fertilized and attaches to the uterine wall. hCG can first be detected in a blood sample about 11 days after conception. Levels of hCG continue to double every 48 to 72 hours. They reach their peak around 8 to 11 weeks after conception. hCG levels then decline and level off, remaining steady for the rest of the pregnancy.