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Table 4 Performance of procalcitonin for detecting patients with bacterial infection at various cutoff values (± 95%CI)

From: Diagnostic accuracy of procalcitonin in critically ill immunocompromised patients

PCT (ng/ml) PCT > 0.5 PCT > 1.35 PCT > 2 PCT > 5
Bacterial infection prevalence = 48.7%
Sensitivity 1.00 ± 0.00 0.81 ± 0.11 0.67 ± 0.12 0.50 ± 0.13
Specificity 0.63 ± 0.12 0.77 ± 0.11 0.82 ± 0.08 0.90 ± 0.08
Positive predictive value 0.72 ± 0.06 0.77 ± 0.10 0.78 ± 0.08 0.83 ± 0.15
Negative predictive value 1.00 ± 0.00 0.81 ± 0.11 0.72 ± 0.08 0.65 ± 0.08
Positive likelihood ratio 2.70 3.52 3.72 5.00
Negative likelihood ratio 0.00 0.25 0.40 0.56
Younden's index 0.63 0.58 0.49 0.40