My MIL is 89, they wanted to run tests on her heart and she wouldn’t let them.
Every so often she has some gastrointestinal problems and we have to take her in to get an IV because she stops eating and drinking and they get so mad when we don’t let them do any tests, we know what is wrong with her and what she needs.
Just beware of health professionals who may call adult protective services if you don’t allow certain tests to be done on your “poor helpless relative”. (not criticizing you, but I know how some of my “comrades in arms’ tend to think!).
“we know what is wrong with her and what she needs.”
—
That just about says it all.