Results of IgG ELISA determinations with six neutrophil granule constituents as antigens, IgM rheumatoid factor, and IgG indirect immunofluorescence (IIF) antineutrophil cytoplasmic antibodies (ANCA) among 50 patients with reactive arthritis (ReA), 30 control patients with ulcerative colitis (UC) and 30 controls with rheumatoid arthritis (RA). Results are shown as numbers (%)
| Anti-PR31-150 | Anti-MPO1-150 | Anti-Lf1-150 | Anti-HLE1-150 | Anti-Cat G1-150 | Anti-BPI1-150 | IgM RF1-150 | ANCA (IIF) | |
| Acute ReA (n=26) | 2 (4) | 2 (4) | 1 (2) | 1 (2) | ||||
| Chronic ReA (n=24) | 1 (2) | 4 (8) | 8 (16) | 1 (2) | 4 (8) | 8 P1-150 (16) | ||
| UC (n=30) | 5 (17) | 3 (10) | 4 (13) | 7 (23) | 6 (20) | 2 (7) | 20 P, 1 C1-150 (70) | |
| RA (n=30) | 5 (17) | 14 (47) | 2 (7) | 4 (13) | 1 (3) | 28 (93) | 9 P (30) |
↵1-150 PR3 = proteinase 3; MPO = myeloperoxidase; Lf = lactoferrin; HLE = human leucocyte elastase; Cat G = cathepsin G; BPI = bactericidal permeability increasing protein; RF = rheumatoid factor; P = P-ANCA; C = C-ANCA.