Artificial insemination (AIH) is also known as intra-uterine insemination (IUI). This treatment involves the placing of concentrated sperm, supplied by the male partner, directly into the uterine cavity at the time of ovulation. Semen is collected by masturbation and then the scientists at the fertility centre concentrate the sperm to select the best available swimming sperm. Normally it takes 2 hours to concentrate a sperm sample to be ready for insemination. The female partner should return a little later that day for insemination.