Question: how can you diagnose pulmonary arterial hypertension?
Answer: Blood tests. Blood tests can help your doctor determine the cause of pulmonary hypertension or look for signs of complications.
Chest X-ray. A chest X-ray creates pictures of your heart, lungs and chest. ... 
Electrocardiogram (ECG). ... 
Echocardiogram. ... 
Right heart catheterization.