Is There a Clear Cause for Pulmonary Hypertension?

When do you start to think about sending additional work up, such as genetic screening, m or other tests? And when we don't have an obvious cause for our patients p h? You know, again, i think patient i had a very extensive work up, but sort of to diagnose idiopathic disease, you want to make sure you've uncovered every stone. Some patients do not want that information, others do. But this part of the field is evolving very rapidly.