Table 3– Diagnostic validity of procalcitonin (PCT) and C-reactive protein (CRP) in differentiating pulmonary tuberculosis from community-acquired pneumonia according to different values

	Sensitivity %	Specificity %	PPV %	NPV %
PCT ng·mL⁻¹
<0.1	78.4	85.4	89.9	70.7
<0.25	86.3	74.2	84.6	76.7
<0.5	91.2	67.7	82.3	79.2
<1.0	92.2	58.0	78.3	81.8
<2.0	96.1	43.5	73.7	87.1
CRP mg·dL⁻¹
<5.0	52.0	88.7	88.3	52.9
<10.0	76.5	72.6	82.1	65.2
<12.5	85.3	56.5	76.3	70.0
<15.0	90.2	54.8	76.7	77.2
<20.0	97.1	29.0	69.2	85.7

PPV: positive predictive value. NPV: negative predictive value.