If you are truly in remission, the tests will (obviously) be normal.
But, if you have active MG affecting your respiratory muscles they will not be normal even on what seems to you as a very good day.
Can you walk the distance a normal person your age can without any breathing difficulties? Or do you rejoice with being able to walk a few blocks?
I know that there were many times in which I thought I had significant improvement, but trying to do something requiring a bit more effort, made me realize that it was mostly my adjustment to this level of activity and not true improvement.
I do hope you are in remission and don't need to see any specialist (other than one hematologist who likes to use silly icons ).