Diagnosis

To diagnose Churg-Strauss syndrome, doctors usually request several types of tests, including:

• Blood tests. A blood test can detect certain antibodies in your blood that can suggest, but not confirm, a diagnosis of Churg-Strauss syndrome. It can also measure the level of eosinophils, although other diseases, including asthma, can increase the number of these cells.
• Imaging tests. X-rays and CT scans can reveal abnormalities in your lungs and sinuses. If you develop signs of heart failure, your doctor may also suggest regular echocardiograms.
• Biopsy of affected tissue. If other tests suggest Churg-Strauss syndrome, you might have a small sample of tissue removed for examination under a microscope. The tissue can come from your lungs or another organ, such as skin or muscle, to confirm or rule out the presence of vasculitis.