Definitions of Urinary Tract Infection in Current Research: A Systematic Review.

Area of Science:

• Urology
• Infectious Diseases
• Clinical Research Methodology

Background:

• Defining urinary tract infection (UTI) is complex due to multiple clinical and diagnostic factors.
• Existing research definitions for UTI lack standardization, complicating comparative analysis.
• Recent studies show significant heterogeneity in diagnostic criteria for UTI.

Purpose of the Study:

• To systematically review and analyze the diverse definitions of UTI used in current scientific literature.
• To identify common parameters and variations in UTI diagnostic criteria across recent studies.
• To underscore the need for a standardized definition of UTI for research purposes.

Main Methods:

• Systematic review of 47 studies published between January 2019 and May 2022.
• Studies focused on therapeutic or prophylactic interventions in adult patients with UTI.
• Analysis of diagnostic criteria including signs/symptoms, pyuria, and urine culture results.

Main Results:

• 85% of studies required signs/symptoms, 28% pyuria, and 55% positive urine culture.
• Only 11% of studies required all three criteria for UTI diagnosis.
• Significant variation observed in bacteriuria thresholds (10^3 to 10^5 CFU/mL) and definitions for acute cystitis and pyelonephritis.

Conclusions:

• Current definitions of UTI are highly heterogeneous across recent research.
• Lack of a consensus-based standard hinders reliable UTI research and clinical practice.
• A standardized research reference standard for UTI is critically needed.