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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