Serological tests in diagnosis of early RA (several answers possible)
| % Responses in questionnaires | |||
|---|---|---|---|
| 1997 (n = 54) | 2000 (n = 44) | 2003 (n = 46) | |
| NA, not available. | |||
| Rheumatoid factor | 100 | 100 | 97.2 |
| Antinuclear antibodies | 72.2 | 68.2 | 78.3 |
| Antikeratin antibodies | 5.6 | 9.1 | 8.7 |
| Antiperinuclear factor | 13.0 | 9.1 | 8.7 |
| Anti-RA33 | 3.7 | 6.8 | 2.2 |
| Anti-CCP | NA | NA | 17.4 |