hCG Levels
hCG Levels Explained: Pregnancy, Testing, and What to Expect
Medically reviewed by Katerina Shkodzik, M.D., OB-GYN
Written by Boris Brut for Mira
HCG: What It Is and Why It Matters
The Role of hCG in Pregnancy
Human chorionic gonadotropin (hCG) is a crucial hormone during pregnancy. That holds especially true in its early stages. Its primary function is to stimulate the so-called corpus luteum, a temporary gland in the ovary, to produce a hormone known as progesterone.
Progesterone supports the growth of the lining of the uterus, reinforcing the endometrial walls and preventing menstrual bleeding, which is essential for maintaining a healthy pregnancy. This progesterone production is particularly critical during the first 3 to 4 weeks following implantation.
