CRP and bacterial infectious disease: The median C-reactive protein (CRP) level at presentation was 3.6 mg/dL (IQR, 1.2-7.5 mg/dL (reference range, <0.1 mg/dL [to convert to milligrams per liter, multiply by 10.0]).6 Moreover, the CRP level was not suspected for a bacterial infection (≤1.0 mg/dL) for 23 patients (21.9%).