What is the chance of sucess of iui?

Varies: With just an insemination in someone who has infertility, pregnancy rates can be between 1 and 20%. It depends on the age of the patient and the situation. Younger age is a better pregnancy rate depending on your hormones. Generally IUI works best in a couple whose only problem is mild male factor (mild changes in sperm count and movement).

It depends: It depends on multiple factors. These include, and aren't necessarily limited to: having normal (open, functioning) fallopian tubes; timing the insemination to the time of ovulation; the skill of the fertility specialist doing the iui; the quantity and quality of the sperm being used for iui; the woman's age!; and the dna structure and functioning of the sperm (fragmentation and decondensation).