Validation of a Quantitative Hematuria Scale.

Area of Science:

• Urology
• Medical Diagnostics

Background:

• Hematuria assessment during continuous bladder irrigation often relies on subjective visual evaluations.
• Lack of standardization in hematuria grading can lead to inconsistent clinical communication and decision-making.

Purpose of the Study:

• To develop a quantitative hematuria scale.
• To assign specific blood concentration percentages to visual descriptors (clear, mild, moderate, severe).
• To standardize hematuria severity assessments and reduce reliance on subjective visual evaluations.

Main Methods:

• Bovine blood samples with varying concentrations (0-100%) were photographed.
• Urologists and healthcare workers surveyed to categorize samples.
• Fleiss' kappa analysis used to assess inter-rater agreement.

Main Results:

• Data from 39 respondents analyzed; consensus categories determined.
• Moderate overall agreement among respondents (Kappa = 0.53).
• Substantial agreement for 'clear' and 'severe'; moderate/fair for 'mild'/'moderate' categories.

Conclusions:

• A promising quantitative hematuria scale foundation was developed.
• The scale reduces reliance on subjective visual judgments for hematuria assessment.
• Enables clearer, consistent communication of hematuria severity in advancing urological care.