In any case of sterility the andrological examination is absolutely necessary; firstly because 50 per cent of the examined men don't show normospermic ejaculate and secondly because nearly 14 per cent of the examined men are infertil. Fertility of man is normal in hypospermia (20 to 40 mill. spermatozoa per ml); it is decreased in oligospermia (less than 20 mill per ml), but real possible. Even kryptospermia (less than one million spermatozoa per ml) can not be identified absolutely with infertility. Hypokinesis and increase of pathomorphic spermatozoa apparently prevent the opportunity of conceptions. It is doubtful that fructose of spermaplasma is a certain criterion of fertility. Extra-matrimonial conceptions probably often occur, for that reason any statement about fertility of man is inaccurately.
