How is pulmonary alveolar proteinosis (PAP) diagnosed?
If your doctor suspects PAP, he or she will first examine you. If you have PAP, your doctor might hear a crackling sound when he listens to your lungs. Other tests are likely, including:
- Blood tests, including those that measure gas levels in your blood
- Pulmonary function tests that measure how well your lungs are working
- Imaging tests, including chest X-rays or high resolution computed tomography (HRCT) scans
- Bronchoscopy, a test that uses a thin scope to look into your airways
- Transbronchial biopsy, a less invasive way of using a bronchoscope to test tissue or fluid from the lungs for further testing
- Open surgical lung biopsy, a test that removes tissue from the lungs to examine under a microscope