Does surgical repair of 3rd grade varicocele, improve semen parameters? if so what are the chances?

Often improved, but?: A grade 3 varicocele indicates it is large enough to be visible & easily felt on exam. I do not believe this necessarily means lower sperm counts. While studies have shown that repairing a varicocele can improve semen analysis about 65-70%, subsequent pregnancy success is not at all certain. Many (up to 70%) couples will still need assisted insemination or IVF to conceive.