IVF may be used for diagnostic or therapeutic reasons. In patients with idiopathic infertility IVF may distinguish between defects in the spermatozoa or oocyte. At present IVF and ET offers patients with either tubal or idiopathic infertility only a small chance of becoming pregnant (4 to 13 per cent). General application of IVF and ET will be determined by future success rates and incidence of fetal malformation. Selection, preparation and management of patients requires a specialized team. Meticulous attention to detail and intense work. Extracorporeal fertilization is prescribed. If the woman hasn’t become pregnant within 10-18 months after operation on restoring of tubal permeability. Woman at the age of 35 and older are not recommended these operations and IVF is prescribed at once. I do hope with this information I have helped you. If not you can do more research on the same. Or you can also ask your doctor for further steps.