Criteria applied to antineutrophil cytoplasmic antibody requests
| Positive selection criteria |
|---|
| Acute or chronic renal failure |
| Polyarteritis nodosa |
| Wegener’s granulomatosis (established or tentative diagnosis) |
| Proteinuria/haematuria requests from renal unit |
| Churg-Strauss syndrome |
| Nephrotic syndrome |
| Chest x ray or lung biopsy abnormality |
| Haemoptysis |
| Nasal septum perforation |
| Henoch-Schonlein purpura |