Table I.

American college of rheumatology diagnostic criteria for Wegener granulomatosis.

Criteria	Characteristics
Nasal or oral inflammation	Painful or painless oral ulcers, purulent or bloody nasal discharge
Abnormal chest radiograph	Nodules, fixed infiltrates, cavities
Urinary sediment	Microhematuria (>5 red blood cells per high-power field), red cell casts
Granulomatous inflammation at biopsy	Involvement of the wall of an artery/arteriole, involvement of the perivascular/extra vascular space

The presence of two or more of the four criteria is associated with a sensitivity of 88.2% and a specificity of 92% for Wegener granulomatosis.