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Classification criteria of MPA according to the Annals of the Rheumatic Diseases of the BMJ.
| Criterion | Score |
|---|---|
| Pauci-immune glomerulonephritis | +3 |
| Blood nasal discharge, ulcer, crusting, congestion or blockage, septal defect/perforation | −3 |
| pANCA or MPO-antibody positivity | +6 |
| Fibrosis or Interstitial Lung Disease on chest imaging | +3 |
| cANCA or PR3-antibody positivity | −1 |
| Eosinophil count ≥1 ×10 (9)/L | −4 |
Total score ≥6 is needed (Sensitivity 87%, Specificity 96%).
