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PAH is not diagnosed in numbered stages like Stage 1-4. Instead, doctors use a classification system called WHO Functional Classes to describe how advanced someone's PAH is based on their symptoms and clinical testing.

The WHO Functional Classes range from Class 1 to Class 4
• Class 1: Few symptoms, even during physical Show Full Answer

PAH is not diagnosed in numbered stages like Stage 1-4. Instead, doctors use a classification system called WHO Functional Classes to describe how advanced someone's PAH is based on their symptoms and clinical testing.

The WHO Functional Classes range from Class 1 to Class 4:
• Class 1: Few symptoms, even during physical activity
• Class 4: Symptoms of right heart failure even while resting

It's important to note that being in Class 4 doesn't necessarily mean "end-stage" PAH, as some people can improve with treatment. To determine PAH severity and progression, healthcare providers look at several factors:
• Pulmonary arterial pressure measurements
• Blood flow patterns in your heart and lungs
• Results from various tests like echocardiograms and right heart catheterization
• Your specific type of PAH
• Other health factors

These measurements help doctors understand how advanced your PAH is and determine the most appropriate treatments for your situation.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

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