In a febrile 2-month-old with a normal chest radiograph and good feeding, which of the following steps is most appropriate next?

In a febrile 2-month-old with a normal chest radiograph and good feeding, which of the following steps is most appropriate next?

• A. Catheterized urinalysis to screen for UTI
• B. Admitting the infant to the hospital for LP and IV antibiotics
• C. Obtaining a blood culture, erythrocyte sedimentation rate, and C-reactive protein
• D. Prescribing empiric, broad-spectrum antibiotics with close follow-up

Answer: (A)

In febrile infants this young, the urinary tract is a common source of serious bacterial infection, and ruling it out quickly is crucial. A catheterized urine sample provides the most reliable urine specimen for urinalysis and culture, minimizing contamination that occurs with bag samples. With a normal chest radiograph and good feeding, the infant appears well, so the best next step is to screen for a UTI rather than jump to invasive tests or broad empiric treatment. If the urinalysis or culture is positive, treat the UTI appropriately; if it’s negative, you can continue evaluation for other sources and manage with close follow-up. Blood tests like ESR or CRP and empiric IV antibiotics aren't needed first-line here without evidence pointing to another serious infection.

In febrile infants this young, the urinary tract is a common source of serious bacterial infection, and ruling it out quickly is crucial. A catheterized urine sample provides the most reliable urine specimen for urinalysis and culture, minimizing contamination that occurs with bag samples. With a normal chest radiograph and good feeding, the infant appears well, so the best next step is to screen for a UTI rather than jump to invasive tests or broad empiric treatment. If the urinalysis or culture is positive, treat the UTI appropriately; if it’s negative, you can continue evaluation for other sources and manage with close follow-up. Blood tests like ESR or CRP and empiric IV antibiotics aren't needed first-line here without evidence pointing to another serious infection.