To the Editor I read with interest the article by Kuppermann et al.1 Results showed that a combination of complete blood count (CBC) absolute neutrophil count less than 4090/mm3 (to convert to ×109 per liter, multiply by 0.001), normal urinalysis results, and procalcitonin (PCT) concentration less than 1.71 ng/mL gave a 99.8% negative predictive value for serious bacterial infections (SBI).
Bonadio W. Efficacy of a Clinical Prediction Rule to Identify Febrile Young Infants at Low Risk for Serious Bacterial Infections. JAMA Pediatr. Published online August 19, 2019173(10):997. doi:10.1001/jamapediatrics.2019.2633
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