[The filtration capacity of the cervix uteri (in-vitro studies) (author's transl)].

In-vitro experiments had been undertaken in order to clarify sperm selection by cervical mucus. Sperm samples, preferably with a high rate of abnormal cells, were obtained from fertile and infertile men for 35 penetration tests. Cervical mucus was collected from fertile women during praeovulatory phase. The penetration tests resulted in a statistically high amount of normal sperm cells which had migrated through cervical mucus as compared to abnormal cells. The significance of this filtration capacity of the cervical mucus will be discussed.