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Table 2 Diagnostic test accuracy of procalcitonin for diagnosing serious infection

From: Diagnostic test accuracy of point-of-care procalcitonin to diagnose serious bacterial infections in children

PCT ng/ml Sensitivity (95% CI) Specificity (95% CI) Negative Predictive Value (95% CI) Positive Predictive Value (95% CI) Negative Likelihood Ratio (95% CI) Positive Likelihood Ratio (95% CI)
0.25 0.80(0.44 to 0.96) 0.62(0.55 to 0.69) 0.98(0.93 to 1.00) 0.10(0.05 to 0.19) 0.32(0.09 to 1.12) 2.12(0.48 to 3.00)
0.50 0.70(0.35 to 0.92) 0.65(0.58 to 0.72) 0.98(0.93 to 1.00) 0.10(0.05 to 0.19) 0.46(0.18 to 1.19) 2.02(1.28 to 3.16)
0.75 0.60(0.27 to 0.86) 0.81(0.74 to 0.86) 0.98(0.93 to 0.99) 0.14(0.06 to 0.29) 0.49(0.23 to 1.06) 3.13(1.75 to 5.61)
1.00 0.60(0.27 to 0.86) 0.84(0.78 to 0.89) 0.98(0.93 to 0.99) 0.16(0.07 to 0.33) 0.48(0.22 to 1.02) 3.74(2.05 to 6.81)
1.25 0.60(0.27 to 0.86) 0.88(0.82 to 0.92) 0.98(0.93 to 0.99) 0.20(0.08 to 0.39) 0.46(0.21 to 0.98) 4.83(2.57 to 9.05)
1.50 0.60(0.27 to 0.86) 0.88(0.82 to 0.92) 0.98(0.93 to 0.99) 0.21(0.09 to 0.40) 0.45(0.21 to 0.97) 5.03(2.67 to 9.50)
1.75 0.50(0.20 to 0.80) 0.91(0.85 to 0.94) 0.97(0.93 to 0.99) 0.22(0.08 to 0.44) 0.55(0.30 to 1.03) 5.36(2.51 to 11.46)
2.00 0.40(0.14 to 0.73) 0.92(0.87 to 0.95) 0.97(0.93 to 0.99) 0.20(0.07 to 0.44) 0.65(0.39 to 1.09) 4.83(1.98 to 11.80)
  1. CI Confidence Interval