Clinical utility of procalcitonin in febrile infants younger than 3 months of age visiting a pediatric emergency room: a retrospective single-center study

Table 5 Predictivity for diagnosing severe bacterial infection using the test results

	Total
	sensitivity	specificity	PPV	NPV
WBC (< 5000 or > 15,000 /μL) & CRP (≥2.0 mg/dL)	67.2	61.3	29.3	88.7
WBC (< 5000 or > 15,000 /μL) & CRP (≥2.0 mg/dL) & Procalcitonin (≥0.3 ng/mL)	80.3	55.5	30.1	92.2

Abbreviations: SBI severe bacterial infection, WBC white blood cell, CRP c-reactive protein

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