In recent years, the quality of germinal cells has been recognized as the main factor determining reproductive potential. Standard sperm analysis is of limited value for predicting both the achievement of a pregnancy and the outcomes of assisted reproductive technologies, which raises the question of the additional significance of functional testing. Most current guidelines recommend to perform additional studies from a scientific point of view, recognizing their importance, but dont include men in the basic diagnostic schemes. In this review, we try to discuss of the relevance of special sperm testing.