Urinalysis in urinary tract infection.

Area of Science:

• Pediatric Nephrology
• Clinical Microbiology
• Diagnostic Pathology

Background:

• Urinary tract infections (UTI) are common in children, necessitating accurate diagnostic methods.
• Routine urine examination is often the first diagnostic step, but its correlation with definitive culture results requires further elucidation.

Purpose of the Study:

• To correlate routine urinalysis parameters with urine culture results in children suspected of UTI.
• To determine the diagnostic accuracy of proteinuria, bacteriuria, and pyuria in identifying UTI in pediatric patients.

Main Methods:

• A study involving 376 children aged 6 months to 5 years with suspected UTI.
• Correlation analysis of four routine urine examination parameters against urine culture reports.

Main Results:

• Proteinuria (79% sensitivity, 80% specificity), bacteriuria (78% sensitivity, 96% specificity), and pyuria > 10 wbc/hpf (80% sensitivity, 82% specificity) showed significant diagnostic value.
• The combination of bacteriuria with either proteinuria or pyuria > 10 wbc/hpf achieved 98% specificity.
• Pyuria > 10 wbc/hpf was more specific (82%) than the conventional > 5 wbc/hpf (66.6%) for UTI diagnosis.

Conclusions:

• Routine urinalysis, particularly when interpreting proteinuria, bacteriuria, and pyuria > 10 wbc/hpf together, can reliably diagnose UTI in children, especially when urine culture facilities are limited.
• Isolated findings of proteinuria, pyuria, bacteriuria, or microscopic hematuria are not definitive indicators of UTI in this age group.