did any of you have to tell your doctors which tests you want specifically?

so far ive only had
nerve tests
and x-rays

and im going to get an mri of my neck but ive read on here of different people getting ultrasound tests, etc. is it normal to have to go into request these? i admit i never have much faith that doctors know what theyre doing :/ this does not help, having to research which tests i need. i feel like they should be helping me with this.

which test would better show inflammation and/or scar tissue, an mri or an ultrasound?

[/end rant]