For infants with CRP OVR 46.1 mg/L (11% of the neonates), the risk for a SBI was 87%, compared with 13% for those with CRP UNDR 46.1 mg/L OVER 40 CRP -TREAT WITH ABX

CRP was found to be the single best indicator for discriminating a non-invasive SBI in both the neonates and older infants


https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5786092/