The aim of the procedure is to collect sperm for In Vitro Fertilization (IVF) directly from the testis or epididymis. The assessment that was carried out to you beforehand allows you to direct towards a secretory origin (defect of intra-testicular production) or towards an obstructive origin (obstacle on the ducts upstream of the testicle). Depending on this origin, the site of the sample will thus be testicular (secretory origin) or epididymal (obstructive origin).