How does intrauterine insemination work and what are the chances of IUI pregnancy success?

During IUI, a sperm sample is processed through sperm washing and placed directly into the uterus using a thin catheter at the time of ovulation. The procedure is quick and does not require anaesthesia. Success rates range from 10% to 20% per cycle depending on age and diagnosis, and can be further improved by combining IUI with ovarian stimulation medication.