Human chorionic gonadotropin (hCG) is a hormone produced during pregnancy by the cells that form the placenta. Its primary role is to maintain the production of progesterone, a hormone crucial for pregnancy, by preventing the breakdown of the corpus luteum in the ovary. The levels of hCG are often used in pregnancy tests as it can be detected in the blood and urine of pregnant women.

Key Takeaways

  1. Human chorionic gonadotropin (hCG) is a hormone that is produced during pregnancy. It is made by cells formed in the placenta, which nourishes the egg after it has been fertilized and attaches to the uterine wall.
  2. The levels of hCG can be measured in blood tests and provide important information about the pregnancy. High or low levels can indicate potential complications such as ectopic pregnancy or prenatal Down Syndrome, while a steady increase typically indicates a normal, healthy pregnancy.
  3. Besides its role in pregnancy, hCG is also used in fertility treatments as it can stimulate the release of eggs in women and testosterone production in men.


Human Chorionic Gonadotropin (hCG) is a hormone that is of significant importance in relation to motherhood, as it plays a crucial role during the early stages of pregnancy.

This hormone is first produced by the cells that form the placenta, the organ that nourishes the egg after it has been fertilized and attached to the uterine wall.

The main function of hCG is to maintain the corpus luteum, which is responsible for the production of progesterone during the first trimester.

Progesterone is essential in maintaining the lining of the uterus to support the developing fetus.

Furthermore, the detection of hCG in a woman’s blood or urine is the primary basis for pregnancy tests, making it a critical marker for confirming pregnancy.


Human Chorionic Gonadotropin (hCG) plays a critical role in pregnancy as it is responsible for the continuation of the pregnancy during its early stages. It does this by maintaining the production of hormones necessary for pregnancy, such as progesterone, by the corpus luteum. hCG aids in fostering the growth of the fetus by ensuring that the lining of your uterus stays thickened and ready for implantation.

It signals your ovaries to stop releasing eggs and focuses on producing more progesterone and estrogen, crucial hormones that help sustain a healthy pregnancy. While hCG is known for its role in pregnancy, it is also used for certain medical purposes. For example, it is often used in fertility treatments for both men and women.

In women, hCG helps in the maturation of the egg within the ovary and triggers its release during ovulation. For men, hCG helps in the production of sperm. It is also used in young boys when their testicles have not yet descended into the scrotum normally.

Examples of Human chorionic gonadotropin (hCG)

Pregnancy Tests: The most common use of hCG in the real world is in home pregnancy tests. These tests work by detecting the presence of hCG in urine. This hormone is specifically produced during pregnancy, and its concentration increases over the course of the first few weeks. Therefore, these tests are most accurate after a missed menstrual period when hCG levels are quite high.

Medical Treatment: hCG is also used as a medication, primarily in fertility treatments. The hormone can stimulate ovulation and support early pregnancy. It is used in IVF treatments to trigger the release of mature eggs from the ovaries, and also used to maintain the corpus luteum, allowing the production of progesterone which is critical to early pregnancy.

Down Syndrome Test: During early pregnancy, doctor might order a “triple” or “quad” screen test which measures the levels of hCG along with other hormones and proteins in the mother’s blood. Abnormal levels of these substances may indicate a risk that the baby has Down syndrome or another type of chromosomal abnormality.

FAQs on Human Chorionic Gonadotropin (hCG)

What is Human Chorionic Gonadotropin (hCG)?

Human Chorionic Gonadotropin (hCG) is a hormone produced within the body during pregnancy, specifically by the cells that make up the placenta.

What is the role of hCG in pregnancy?

The role of hCG in pregnancy is to keep the estrogen and progesterone levels at their appropriate levels until the placenta has developed enough to take over this function.

How does hCG affect a pregnancy test?

Pregnancy tests detect the presence of hCG. A high level of hCG is a clear indication that a woman may be pregnant. That’s why the presence of hCG in blood or urine is a good early indicator of pregnancy.

What are the normal hCG levels in pregnancy?

The levels of hCG in a pregnant woman’s blood and urine can vary widely. Levels can range from 5 to 50 mlU/ml in the first week of pregnancy and can increase to 50 to 300,000 mlU/ml in the third month.

Do hCG levels differ in cases of multiple pregnancies?

Yes, hCG levels typically increase at a faster rate in cases of multiple pregnancies, such as twins or triplets, due to the presence of multiple placenta cells secreting hCG.

Related Motherhood Terms

  • Pregnancy Test: A diagnostic tool typically used to detect the presence of hCG, thereby confirming pregnancy.
  • Implantation: The process in which a fertilized egg (embryo) attaches itself to the walls of the uterus. hCG production begins after this step.
  • Trophoblast: Cells forming the outer layer of a blastocyst, which provide nutrients to the embryo and develop into a large part of the placenta. They are involved in the production of hCG.
  • Progestin: Hormones that help prepare the uterus for pregnancy and maintain it. Their levels are regulated by hCG during early pregnancy.
  • Fertility Treatments: Medical interventions like in-vitro fertilization that often involve the use and tracking of hCG levels to ensure successful implantation and pregnancy.

Sources for More Information

  • Mayo Clinic is a renowned medical center that provides information on procedures, conditions, and hormones like hCG.
  • The Johns Hopkins Medicine website provides empirical, research-based information on various medical topics including hCG.
  • WebMD offers a wealth of medical information, including details on hormones like hCG and their role in pregnancy.
  • American College of Obstetricians and Gynecologists (ACOG) provides professional resources on wide range of women’s health topics, including hCG.