Table 3. Indirect immunofluorescence-antineutrophil cytoplasmic antibodies (IIF-ANCA) features of tests performed at the Immuno-Rheumatology laboratory and in independent laboratories at diagnosis.
| IIF-ANCA | GPA | MPA | EGPA | RLV | Type 1 AIH | UC |
|---|---|---|---|---|---|---|
| Tests performed at Immuno-Rheumatology laboratory | 15 | 4 | 5 | 1 | 3 | 3 |
| Positive tests, n (%) | 5 (33.3) | 2 (50.0) | 0 (0.0) | 1 (100.0) | 1 (33.3) | 1 (33.3) |
| C-ANCA, n (%) | 5 | 0 | 0 | 0 | 0 | 1 |
| P-ANCA, n (%) | 0 | 1 | 0 | 1 | 0 | 0 |
| A-ANCA, n (%) | 0 | 1 | 0 | 0 | 1 | 0 |
| Tests performed in outside laboratories | 7 | 3 | 1 | 0 | 1 | 0 |
| Positive tests, n (%) | 5 (71.4) | 3 (100.0) | 0 (0.0) | - | 1 (100.0) | - |
| C-ANCA, n (%) | 4 | 2 | 0 | - | 0 | - |
| P-ANCA, n (%) | 1 | 1 | 0 | - | 0 | - |
| A-ANCA, n (%) | 0 | 0 | 0 | - | 1 | - |
AIH: autoimmune hepatitis; EGPA: eosinophilic granulomatosis with polyangiitis; GPA: granulomatosis with polyangiitis; MPA: microscopic polyangiitis; RVL: renal limited vasculitis; UC: ulcerative colitis; n: number of patients. The total number of tests performed at the Immuno-Rheumatology laboratory was 31 while 12 tests were performed in independent laboratories at diagnosis.