A–Z Glossary

Discriminatory zone

The discriminatory zone is an hCG level above which an intrauterine pregnancy is often expected to appear on transvaginal ultrasound.

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Pregnancy blood test (hCG) and quantitative hCG explained

Pregnancy blood test (hCG) and quantitative hCG explained

What is hCG? Human chorionic gonadotropin is a glycoprotein hormone produced primarily by placental trophoblast cells after implantation. Its early role is to support the corpus luteum, which helps maintain progesterone production until the placenta becomes more hormonally self-sufficient. In practical terms, hCG is the hormone detected by pregnancy tests. It enters the bloodstream first […]