Systematic review of the diagnostic accuracy of C-reactive protein to detect bacterial infection in nonhospitalized infants and children with fever.
OBJECTIVE
To determine the accuracy of C-reactive protein (CRP) for diagnosing serious bacterial and bacterial infections in infants and children presenting with fever.


METHODS
Systematic review of diagnostic accuracy studies. We included studies comparing the diagnostic accuracy of CRP with microbiologic confirmation of (a) serious bacterial and (b) bacterial infection.


RESULTS
For differentiating between serious bacterial infection and benign or nonbacterial infection (6 studies), the pooled estimate of sensitivity was 0.77 (95% CI, 0.68, 0.83); specificity, 0.79 (95% CI, 0.74, 0.83); positive likelihood ratio, 3.64 (95% CI, 2.99, 4.43); and negative likelihood ratio, 0.29 (95% CI, 0.22, 0.40). In multivariate analysis, CRP is an independent predictor of serious bacterial infection. 3 studies investigating the accuracy of CRP for diagnosing bacterial infection could not be pooled, but all showed a lower sensitivity compared with studies using serious bacterial infection as the reference diagnosis.


CONCLUSIONS
CRP provides moderate and independent information for both ruling in and ruling out serious bacterial infection in children with fever at first presentation. Poor sensitivity means that CRP cannot be used to exclude all bacterial infection.
The School of Medicine, The University of Queensland, Royal Brisbane Hospital Complex, Queensland, Brisbane, Australia. s.sanders@uq.edu.au
Sharon
S
Sanders
Adrian
A
Barnett
Ignacio
I
Correa-Velez
Mark
M
Coulthard
Jenny
J
Doust
D001424:Bacterial Infections / Q000175:diagnosis*; D002097:C-Reactive Protein / Q000032:analysis*; D002648:Child; D005334:Fever / Q000097:blood*; D006801:Humans; D012680:Sensitivity and Specificity
D002097:C-Reactive Protein