| Sensitivity | Specificity | Positive predictive value | Negative predictive value | ROC Area* | |
| Detection of anti-155/140 antibody | 50.0 | 95.9 | 42.1 | 97.0 | 0.73 |
| Negative antibody result on hospital-based routine immunology testing†| 87.5 | 45.1 | 8.7 | 98.4 | 0.66 |
| Negative antibody result on hospital-based routine immunology testing and detection of anti-155/140 antibody | 93.8 | 44.7 | 9.3 | 99.2 | 0.69 |
ROC, receiver-operator characteristic.
*Sensitivity + specificity/2.
†Includes testing for anti-Jo-1, anti-Ku, anti-PM-Scl, anti-U1-RNP, anti-U3-RNP.