Killer Cells

Starlight • Expecting a miracle baby after a long road!
I saw another post about this (but haven't gotten any responses, so I'm making a new post). Who should be tested for Killer Cells? Anyone with autoimmune diseases?  And the only after recurrent miscarriages or failed IVFs? Or would over a year of not being able to conceive be enough. 
I'm preparing for my first <a href="https://glowing.com/glow-fertility-program">IVF</a> and want to be sure my body is ready. 
But do you have to go to a Reproductive  Immunologist? Or can your RE or GP order the tests?
Thank you!