Short answer · Medically reviewed summary · Last updated: 2026-05-08
Churg-Strauss Syndrome, now formally known as Eosinophilic Granulomatosis with Polyangiitis (EGPA), is diagnosed through a combination of clinical evaluation, blood work, imaging, and tissue biopsy. Because symptoms often mimic common conditions like asthma, diagnosis frequently involves a multidisciplinary approach to identify the hallmark elevation of eosinophils and systemic inflammation. How is Churg-Strauss Syndrome diagnosed? There is no single "gold standard" test for Churg-Strauss Syndrome; instead, clinicians rely on the 1990 American College of Rheumatology criteria.
How is Churg Strauss Syndrome diagnosed?
How Churg Strauss Syndrome is diagnosed: tests, specialists and the diagnostic journey, told by patients and reviewed against medical sources.
Churg-Strauss Syndrome, now formally known as Eosinophilic Granulomatosis with Polyangiitis (EGPA), is diagnosed through a combination of clinical evaluation, blood work, imaging, and tissue biopsy. Because symptoms often mimic common conditions like asthma, diagnosis frequently involves a multidisciplinary approach to identify the hallmark elevation of eosinophils and systemic inflammation.
How is Churg-Strauss Syndrome diagnosed?
There is no single "gold standard" test for Churg-Strauss Syndrome; instead, clinicians rely on the 1990 American College of Rheumatology criteria. A diagnosis is typically considered when at least four of the following six features are present: asthma, eosinophilia (greater than 10% of the white blood cell count), neuropathy, migratory pulmonary opacities, paranasal sinus abnormalities, and biopsy evidence of extravascular eosinophils.
Which tests are required for confirmation?
To confirm Churg-Strauss Syndrome, your medical team will likely order the following:
- Complete Blood Count (CBC): To check for high levels of eosinophils.
- ANCA Testing: Anti-neutrophil cytoplasmic antibodies are positive in about 30-40% of Churg-Strauss Syndrome cases.
- Imaging: Chest X-rays or CT scans to identify lung involvement.
- Biopsy: A sample of affected tissue (often skin, lung, or nerve) to look for necrotizing vasculitis and eosinophilic infiltration.
Why is the diagnostic journey often so long?
Many of the 126 members of our DiseaseMaps community report a significant "diagnostic odyssey," often waiting months or years for an accurate Churg-Strauss Syndrome diagnosis. Because the early phases of Churg-Strauss Syndrome often present as treatment-resistant asthma or chronic sinusitis, it is frequently confused with allergic disorders or other types of vasculitis. Seeking care from a rheumatologist or a vasculitis specialist is essential, as general practitioners may not encounter this rare condition frequently enough to recognize its complex presentation.
Next steps
- Consult a rheumatologist or an immunologist with specific expertise in systemic vasculitis.
- Request a referral to a center of excellence that specializes in Churg-Strauss Syndrome.
- Connect with our community of 126 patients on DiseaseMaps.org to share experiences and find emotional support.
- Keep a detailed symptom log to assist your specialist during your initial consultation.
Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Eosinophilic granulomatosis with polyangiitis.
- Orphanet: Eosinophilic granulomatosis with polyangiitis (ORPHA:398).
- Vasculitis Foundation: Information on EGPA/Churg-Strauss.
- American College of Rheumatology: Classification Criteria for EGPA.
