The sensitivity and specificity of 3 markers in systemic lupus erythematosus (SLE) patients with bacterial infections. Positive cutoff values were determined by receiver-operating characteristics curves. Cutoff values of procalcitonin, S100 A8/A9, and CRP are 0.025 ng/ml, 1.975 μg/ml, and 1.35 mg/dl, respectively.
| Markers | Sensitivity (%) | Specificity (%) |
|---|---|---|
| CRP | 100 | 90 |
| S100A8/A9 | 85.2 | 53.3 |
| Procalcitonin | 38.2 | 93.3 |
| S100A8/A9 and CRP | 85.3 | 93.3 |
CRP: C-reactive protein.