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If PH is suspected, there will be a round of other testing looking for contributing or causative factors. Along with pulmonary function testing, you might be given some blood work looking at all sorts of things, a chest CT, and a stress echo. Often a sleep study is done, as there is a correlation between sleep apnea and PH.
I was also tentatively diagnosed with pulmonary hypertension last year, but was told it was absolutely not definate unless I had a cath done, which I declined at the time. Instead, I lost a bunch of weight and worked on increasing exercise, and the next stress echo I had done, my pressures were all normal.
Good luck.