Någon gjorde Natural Cell Killer prov innan börjar med IVF?

Hej mommies and mommies to be :)

My man and i are going to get our fertility check up on my this coming cycle. Have anyone done Natural Cell Killer test before begin with the IVF treatment? Or will they do it before the treatment starts?
We have been trying since 2009 and no luck. I read on other forums that it can be the cause for the difficulties for female to get pregnant. :(
We are going to RMC Malmö.
Avoiding everyone from having headache with my bad swedish grammar :)