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The 18 pages that link to Human chorionic gonadotropin, each with the reason it gives.

• PregnancyRelated: Its presence in blood and urine forms the basis of most pregnancy tests.

• PlacentaRelated: Placental hormone production helps sustain pregnancy before the placenta takes over steroid production.

• ProgesteroneRelated: It maintains ovarian progesterone production until the placenta takes over.

• Ectopic pregnancyRelated: Serial hormone measurements help assess whether a pregnancy is developing normally.

• Luteinizing hormoneRelated: Its receptor activity resembles LH, so it can trigger final follicular maturation.

• Follicle-stimulating hormoneCompared with: It can replace LH-like activity in fertility treatment, unlike FSH's direct follicular stimulation.

• Thyroid-stimulating hormoneCompared with: Its receptor cross-activity can affect thyroid function and TSH levels during pregnancy.

• HypogonadismRelated: It can support testosterone production and fertility in some forms of central hypogonadism.

• ImplantationRelated: Its production begins as trophoblast develops after implantation starts.

• Pregnancy testRelated: Most tests detect this hormone, whose concentration rises after implantation.

• GestationRelated: Its early rise signals pregnancy and helps sustain the uterine lining.

• Testosterone replacement therapyCompared with: It can support endogenous production and fertility in some cases where replacement suppresses both.

• Luteal phaseRelated: It prevents corpus-luteum regression when implantation establishes pregnancy.

• TrophoblastRelated: Trophoblast-derived hormone production helps maintain the uterine environment after implantation.

• Ovarian hyperstimulation syndromeRelated: An hCG trigger can intensify ovarian VEGF release and precipitate or prolong symptoms.

• Rosalyn Sussman YalowRelated: Radioimmunoassay helped establish highly sensitive hormone detection in clinical testing.

• Molar pregnancyRelated: Molar tissue can produce unusually high levels, and serial measurements track whether it persists after treatment.

• Morning sicknessRelated: Its rapid rise in early pregnancy is associated with nausea, though it does not explain every case.