Is Chorionic a Hormone?
No, "chorionic" is not a hormone. It is an adjective describing tissues or structures from the chorion, the outermost fetal membrane in placental mammals that forms part of the placenta during pregnancy.[1]
What Is the Chorion?
The chorion surrounds the embryo and contributes to the placenta, facilitating nutrient and gas exchange between mother and fetus. It produces hormones but is not one itself.[2]
Hormones Associated with 'Chorionic'
"Chorionic" appears in names of hormones secreted by chorionic cells:
- Human chorionic gonadotropin (hCG): Supports pregnancy by maintaining the corpus luteum, which produces progesterone. Detectable in pregnancy tests.[3]
- Human chorionic somatomammotropin (hCS or placental lactogen): Regulates maternal metabolism to provide glucose for the fetus.[4]
These are distinct protein hormones, not synonymous with "chorionic."
How Chorionic Hormones Function in Pregnancy
hCG peaks around weeks 8-10, then declines; it signals the ovaries to sustain progesterone until the placenta takes over. Low levels may indicate miscarriage risk; high levels can signal multiples or molar pregnancy.[5]
Common Tests Involving Chorionic Hormones
Pregnancy tests measure urinary or blood hCG. Non-invasive prenatal testing (NIPT) analyzes cell-free fetal DNA from maternal blood, sometimes alongside hCG for screening chromosomal issues like Down syndrome.[6]
[1]: Merriam-Webster Medical Dictionary - Chorionic
[2]: Britannica - Chorion
[3]: Mayo Clinic - hCG in Pregnancy
[4]: NCBI - Human Placental Lactogen
[5]: American Pregnancy Association - hCG Levels
[6]: ACOG - Prenatal Genetic Screening Tests