TABLE 3.

LRs for Selected Range of Values of PCT, CRP, and Leukocyte Counts and Posttest Probability of SBI in Children With FWS

nLR (95% CI)Posttest Probability (%)
PCT
 <0.5 ng/mL540.09 (0.02–0.36)3
 0.5–2262.8 (1.49–5.33)54
 >2195.2 (2.20–12.42)68
CRP
 <40 mg/L610.26 (0.13–0.54)10
 40–100222.0 (1.04–4.01)45
 >1001614.5 (3.46–60.70)86
Leukocyte
 <15 G/L660.65 (0.44–0.97)21
 15–20151.6 (0.63–4.11)40
 >20182.4 (1.07–5.46)49
  • Pretest probability: 29%.