It is the process which involves placement of processed semen into the uterine cavity which permits sperm – ovum interaction in the absence of intercourse. 0.3 to 0.8 ml of washed , processed and concentrated sperm is injected into the uterine cavity using a catheter. Paent should remain immobile for approximately 15 minutes following the procedure. Ideally the total mobile sperm count in the IUI specimen should be 10 million or more . Success rate is between 10 to 15 % for the first cycle but can be up to 30 – 40 % in 4 – 6 cycles. No benefits after 6 cycles of IUI.