When testing is done in well-appearing infants between 1 month and 3 months of age, infants who have any of the following should be admitted to the hospital for treatment with age-specific empiric parenteral antibiotics as described above: CSF pleocytosis An abnormal urinalysis or chest x-ray A peripheral WBC count ≤ 5, 000 / mcL (≤ 5 × 10 9 / L) or ≥ 15, 000 / mcL (≥ 15 × 10 9 / L) An absolute neutrophil count ≥ 4000 / mcL (≤ 4 × 10 9 / L) Abnormal inflammatory marker levels (procalcitonin > 0.5 ng / mL [< 0.5 mg / L] and / or CRP > 2 mg / dL [> 20 mg / L]) If empiric antibiotics are to be given, lumbar puncture with CSF analysis should be strongly considered if not previously done, especially in infants 29 to 60 days of age.