Table 6 Classification criteria for Wegener's granulomatosis.

Three of the following six features should be present:

• Abnormal urinalysis*

• Granulomatous inflammation on biopsy†

• Nasal sinus inflammation

• Subglottic, tracheal, or endobronchial stenosis

• Abnormal chest x ray or CT

• PR3 ANCA or C‐ANCA staining

*Haematuria and/or significant proteinuria.

†If a kidney biopsy is done it characteristically shows necrotising pauci‐immune glomerulonephritis.

ANCA, antineutrophil cytoplasmic antibodies.