I've had so many tests done a alot of them several times.

Tests I had for PH Diagnosis

Bi-Heart Cath
Cat scan with contrast
Right Heart Cath x3 including Fluid Challenge in last one
Pulmonary Function tests
6 minute walks
Sleep Study
Lung Perfusion test
Traditional Echocardiogram
PH Protocol Echocardiogram with contrast
Bubble test

Also there are plenty of examples w/ members who it can take a long time to get the actual diagnosis because as Heather mentioned there are numerous tests to be peromed if your case isn't cut & dry. It took a long time for me to get a diagnosis.

There are several diagnostic tests that will determine the causality of the illness and fine tune if it is PAH or PH. And it is very possible to have errors made early on.

😀 having a great week! Hope all is well with you all.