IUI is has a low chance of success at what sounds like 4 million sperm/microlitre level.

Low LH, FSH indicate low testicular response to stimulation. High prolactin levels may signal an underlying thyroid abnormalitiy or my be medication related. Once these potential issues have been addressed, have your husband checked for Testicular Varicocoeles by a MALE infertility specialist... these often run in families and are frequently missed. Do your husbands testicles every retract to his abdominal wall??? If not varices may be an issue. IVF may ultimately be your only option. 50% of all fertility is male related.

Hi, I would like to inform you in modern medicine there are only very few couples who can't conceive. all you have to do is to go to a good fertility clinic with your husband, GPs will not be helpful in your case. Sperm donation & IUI is not the only option for you as a couple. There are methods to retrieve sperms directly from the testes even if there is no sperm in the semen & then get it fertilized with your own egg. This method is called ICSI & is now a method of choice for couples like you who don't want donated sperms. In addition, Please note that high blood prolactin concentration interferes with the normal function of the testes by decreasing the production of testosterone (the male sex hormone) and sperm concentration will decrease. This low testosterone in turn will lead to a high serum FSH & LH concentration. Therefore, he may be suffering from a totally treatable cause of infertility that is hyperprolactinemia & treating this medically, alone may bring his semen analysis to normal if this is the sole cause of his problem. So, please find a good clinic & get his high prolactin treated. May God bless you.