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Table 4 Multilevel likelihood ratios for hsCRP and PCT to diagnose CAP in patients with an infiltrate on chest radiography

From: Diagnostic and prognostic accuracy of clinical and laboratory parameters in community-acquired pneumonia

  N (%) Sensitivity Specificity LR + LR -
PCT (μg/L)      
> 0.1 349 (89) 0.90 0.39 1.48 0.25
> 0.25 280 (71) 0.74 0.74 2.83 0.35
> 0.5 217 (55) 0.57 0.83 3.30 0.52
> 1.0 163 (41) 0.43 0.87 3.31 0.65
hsCRP (mg/L) N (%) Sensitivity Specificity LR + LR -
> 40 349 (89) 0.89 0.17 1.07 0.65
> 50 339 (86) 0.87 0.26 1.17 0.52
> 100 265 (67) 0.69 0.61 1.76 0.51
> 200 136 (34) 0.36 0.91 4.14 0.70