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Urinary tract infections in febrile infants younger than 8 weeks of age
1Department of Pediatrics, Albert Einstein College of Medicine, Bronx, New York.
Insights
In febrile infants under 8 weeks, urinalysis alone is insufficient for diagnosing urinary tract infections (UTIs). Urine cultures from catheter or suprapubic aspiration are crucial for accurate UTI diagnosis in this age group.
Area of Science:
- Pediatrics
- Infectious Diseases
- Urology
Background:
- Febrile infants younger than 8 weeks are at risk for serious bacterial infections, including urinary tract infections (UTIs).
- Accurate and timely diagnosis of UTIs in this vulnerable population is critical to prevent complications.
- Traditional methods of UTI diagnosis in infants can be challenging due to non-specific symptoms and limitations of specimen collection.
Purpose of the Study:
- To evaluate the diagnostic utility of urinalysis and the necessity of urine cultures in febrile infants younger than 8 weeks.
- To determine the most reliable method for urine specimen collection in this age group.
- To identify risk factors associated with UTIs in febrile infants.
Main Methods:
- Prospective study involving 442 infants younger than 8 weeks with temperatures >= 100.6°F (38.1°C).
- Analysis of clinical and laboratory data, including urinalysis results and urine culture outcomes.
- Comparison of urine culture results based on collection method (bag, catheter, suprapubic aspiration) and patient demographics (circumcision status).
Main Results:
- Urinary tract infections (UTIs) were identified in 7.5% of infants, with 2 cases of bacteremia.
- Clinical and laboratory findings, including urinalysis, were not reliable for identifying UTIs; over half of UTIs would have been missed without urine culture.
- Bag-collected urine specimens had higher rates of indeterminate results compared to catheter or suprapubic specimens. Uncircumcised males had a higher incidence of UTIs.
Conclusions:
- Urinalysis is insufficient for ruling out UTIs in febrile infants younger than 8 weeks.
- Catheter or suprapubic aspiration for urine culture is essential for accurate UTI diagnosis in all febrile infants in this age group.
- Consider circumcision status as a potential risk factor for UTIs in febrile infants.
Abstract:
In this prospective study of 442 infants younger than 8 weeks of age who attended a pediatric emergency department with temperature greater than or equal to 100.6 degrees F (38.1 degrees C), urinary tract infections (UTIs) were found in 33 patients (7.5%), 2 of whom were bacteremic. Clinical and laboratory data were not helpful for identifying UTIs. Of the 33 patients with UTIs, 32 had urinalyses recorded; 16 were suggestive of a UTI (more than five white blood cells per high-power field or any bacteria present). Of the 16 infants with apparently normal urinalysis results, three had an emergency department diagnosis suggesting an alternative bacterial focus of infection. If the physician had decided on the basis of apparently normal urinalysis results to forgo obtaining a urine culture, more than half of the UTIs would have been missed. Bag-collected specimens were significantly more likely to yield indeterminate urine culture results than either catheter or suprapubic specimens. In addition, uncircumcised males were significantly more likely to have a UTI than circumcised boys. These results suggest that a suprapubic or catheter-obtained urine specimen for culture is a necessary part of the evaluation of all febrile infants younger than 8 weeks of age, regardless of the urinalysis findings or another focus of presumed bacterial infection.