What is the primary purpose of human chorionic gonadotropin during pregnancy?

The primary purpose of human chorionic gonadotropin (hCG) during pregnancy is to maintain the uterine lining. This hormone is produced by the developing placenta soon after implantation and plays a crucial role in signaling the ovaries to continue producing progesterone. Progesterone is essential for sustaining the uterine lining and preventing menstruation, allowing the embryo to develop without interruption.

hCG levels are often measured in pregnancy tests, as its presence indicates that the body is supporting an early pregnancy. While hCG does have other roles and effects, such as contributing to the developmental processes throughout pregnancy, its critical function in maintaining the uterine lining is what sustains the early stages of pregnancy and supports the implantation process. This hormonal signaling helps create a suitable environment for the embryo to grow and thrive, making it a key player in the early days of gestation.