1.1 Male infertility: the failure to achieve a clinical pregnancy after 12 months or more of regular unprotected sexual intercourse

1.2 Primary male infertility: male who has never initiated a clinical pregnancy and meet the criteria of being classified as infertile.

1.3 Secondary infertility: a couple where the man is unable to initiate a clinical pregnancy but who had previously initiated a clinical pregnancy (with the same or different sexual partner)

1.4 RPL: two or more failed pregnancies.

1.5 Azoospermia: absence of sperms in ejaculate

1.6 Oligospermia: sperm concentration less than 15 million/ml

1.7 Severe Oligospermia: sperm concentration less than 5 million/ ml

1.8 Pyospermia: white blood cells more than 1 million / ml

1.9 Hypogonadotropic Hypogonadism: is secondary hypogonadism