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Table 4 Diagnostic accuracy of serum PCT for the diagnosis of sepsis in critically ill patients with either primary or secondary BSI-related sepsis.

From: Impact of previous sepsis on the accuracy of procalcitonin for the early diagnosis of blood stream infection in critically ill patients

PCT cutoff value (ng/mL) Sepsis type Sensitivity (%) Specificity (%) Positive predictive value (%) Negative predictive value (%)
PCT ≥ 0.25 Primary 98.3 47.8 90.5 84.6
  Secondary 90.3 47.8 82.3 64.7
PCT ≥ 0.50 Primary 94.9 65.2 93.3 71.4
  Secondary 83.9 65.2 86.7 60.0
PCT ≥ 1.00 Primary 89.7 73.9 94.6 58.6
  Secondary 72.6 73.9 88.2 50.0
PCT ≥ 2.00 Primary 83.8 82.6 96.1 50.0
  Secondary 58.1 82.6 90.0 42.2
  1. PCT: procalcitonin; BSI: blood stream infection.