The spermogram is the simplest and the most important diagnostic to iniciate studies of male fertility. We are able to assess physical aspects such as volume, pH, mucus, viscosity, colour, and odour as well as cellular aspects related to the spermatozoids such as their number, mobility, morphology, and vitality. In addition, it provide us with valuable information as to the presence and characteristics of other cells such as macrophages, lymphocytes, leucocytes, bacteria, and fungi. The seminal fluid produced by the accessory sexual glands may also be evaluated by biochemical and immunological means.