Semen washing is a procedure used to prepare sperm. It allows your partner’s sperm a better chance for survival and fertilization. The semen sample is washed with special media to remove the debris, white blood cells, and prostaglandins, which can cause the uterus to contract. The processing also removes dead sperm and concentrates the sperm into a small volume which can easily be handled by the uterus. There are three main methods of sperm washing; the swim-up, density gradient wash, and simple (centrifugation) wash. The type of wash used depends on the individual characteristics of each semen specimen. The freezing and storing facility for sperms is under-taken after surgical extraction in-patients with moderate to severe male factor infertility . Sperms can also be stored to be used at a later date in specific situations.