Sensitivity and specificity of the presence of one or more anticitrullinated protein antibodies (anti-pepAs, anti-pepB, and anti-CCP2 antibodies)
| Measurement | Cumulative number of positive assays | |||
|---|---|---|---|---|
| All assays negative | At least one assay positive | At least two assays positive | All three assays positive | |
| Sensitivity | 24.6% (29/118 RA) | 75.4% (89/118 RA) | 65.3% (77/118 RA) | 50.8% (60/118 RA) |
| Specificity | 2.1% (143/146 non-RA) | 97.9% (3/146 non-RA) | 100% (0/146 non-RA) | 100% (0/146 non-RA) |