What is IUI? This is a procedure where processed semen is injected into the uterine cavity using an intrauterine catheter. IUI with husband, s semen is indicated in patients with unexplained infertility, patients with PCOS who have not been able to conceive naturally, patients in which the husband , s semen shows borderline oligospermia Or low sperm count, or Asthenospermia meaning poor motility, also patients with endometrioses IUI with donor semen is resorted to in patients with Azoospermia which is irreversible