Human chorionic gonadotropin (HCG) is a hormone produced by the embryo during the early stages of pregnancy and plays an important role in female fertility. It helps in fertility in the following ways:
1. Promoting luteal function
One of the most important roles of HCG is to support luteal function. The corpus luteum is the tissue formed by the ovaries after ovulation and is responsible for the secretion of progesterone (mainly progesterone). Progesterone is essential for maintaining early pregnancy as it contributes to the thickness of the uterine lining and ensures that the fertilised egg can successfully attach and survive in the uterus. Without sufficient progesterone, the fertilised egg may not successfully implant and result in miscarriage. HCG ensures that the intrauterine environment is suitable for the maintenance of pregnancy by stimulating the corpus luteum to continue to secrete progesterone.
2. Promoting follicular development and ovulation
In assisted reproductive technologies (e.g. in vitro fertilisation, IVF), HCG is often used as an ovulation inducer. When a woman is undergoing ovulation induction therapy, the use of HCG mimics the natural peak of luteinising hormone (LH), which prompts the rupture of a mature follicle and the release of an egg. This process is critical for conception, especially if a woman has poor ovarian function or ovulation disorders. HCG is used to improve ovulation success.
3. Maintaining embryo development
HCG also serves as a key regulator of embryonic development. In early pregnancy, it supports progesterone secretion until the placenta matures and independently produces enough hormones to sustain pregnancy, laying the foundation for normal fetal growth.
4. Clinical applications
Clinically, HCG injections are widely used to assist infertile women in treatments like IVF and artificial insemination. Exogenous HCG supplementation allows precise control of ovulation timing, increasing the odds of conception. Additionally, HCG's rapid concentration rise in early pregnancy forms the basis for pregnancy test strips, enabling early detection of pregnancy.
In summary, HCG is indispensable for female fertility. It plays a non-replaceable role in both ART procedures and natural pregnancy, supporting embryonic development, luteal function, and progesterone production to ensure reproductive health.
