Glossary Overview

Find out about some important fertility terms.

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Human Chorionic Gonadotropin (hCG)

The hormone produced in early pregnancy, released by the placenta after implantation, which keeps the corpus luteum producing estradiol and progesterone and thus prevents menstruation. Also used via injection to trigger ovulation after some fertility treatments, and used in men to stimulate testosterone production.

Hydrosalpinx

Blocked, dilated, fluid-filled fallopian tube.

Hypogonadism

Inadequate ovarian or testicular function as shown by low sperm production or lack of follicle production, as well as low or absent levels of luteinizing hormone (LH) and follicle stimulating hormone (FSH).

Hypogonadotropic Hypogonadism/Hypogonadotropic Hypogonadal (HH)

Hypogonadotropic hypogonadism (HH) is a rare condition in which impaired activity of the hypothalamus or pituitary results in below-normal function of the gonads and in abnormally low luteinizing hormone (LH) and follicle stimulating hormone (FSH) serum levels and consequential negligible estrogen levels. (The gonads are the ovaries and testes. The hormones they normally produce include estrogen, progesterone, and testosterone.)

Hypothalamus

The gland at the base of the brain that controls the release of hormones from the pituitary glands.

Hysterosalpingogram (HSG)
An X-ray procedure in which a liquid dye (contrast) is injected through the cervix into the uterine cavity to illustrate the inner shape of the uterus and degree of openness of the fallopian tubes. If the tubes are open, the liquid will spill out the ends of the tubes. If the tubes are blocked, the liquid is trapped.
Hysteroscopy

A visual examination of the uterus using an instrument called a hysteroscope, which enables the doctor to see into the organ without making a large incision.

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