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OHSS (Ovarian Hyperstimulation Syndrome) is one of potential complications of Pergonal ovulation induction treatment, which may even be life – threatening. It occurs, if too much follicles develop, and HCG is given in order to release the eggs.

Oligomenorrhea is the term, which is used to describe infrequent menstrual periods.

Oligospermia
, Oligozoospermia are the terms, used to describe the presence of an extremely low number of sperm (less than 20 million) in the ejaculate.

Oocyte
is the female germ, which is also called an egg.

Oocyte Donation
takes place in case, if it is not possible to retrieve healthy oocytes or eggs from a woman’s ovaries, IVF is possible to be achieved using oocytes from a donor.

Oral Contraceptive
(the Pill) is an ovulation and pregnancy preventing medication. Some women become anovulatory after they stop to take it. Taking the pill may also lead to fertility problems, like an irregular menstruation cycle or endometriosis. However, the pill may also be used in order to control the symptoms and the development of endometriosis.

Orgasm
is the psychological as well as the physiological thrill of the body, which accompanies sexual climax. Orgasm causes ejaculation for men.

Ovarian Failure
is the inability of the ovary to respond to FSH stimulation from the pituitary gland, either because of some damage to or malformation of the ovary. It is possible to diagnose it with the help of blood test conducting, if it shows elevated levels of FSH in it.

Ovarian Hyperstimulation
is the application of different fertility drugs in order to induce the ovaries to produce and release more than one egg at once.

Ovary
is the sex gland of a female which also bears a reproductive function (it releases oocytes) as well as a hormonal function (it produces estrogen and progesterone).

Ovulation
is the process, occurring every month in every healthy woman’s organism, during which the mature egg is released from the surface of the ovary.

Ovulation
Induction is the female hormone therapy application in order to stimulate the development and the release of the oocyte.

Ovum
(ova) (egg) is a mature oocyte. It is produced in every healthy woman’s ovaries during each menstrual cycle.