Standardization of the urine microscopic examination

Area of Science:

• Clinical chemistry
• Urology
• Laboratory medicine

Background:

• Standardized urinalysis is crucial for accurate diagnosis.
• Existing methods for urine sediment examination vary in their clinical relevance.
• Comparing automated systems is essential for improving diagnostic workflows.

Purpose of the Study:

• To compare the clinical relevance of two standardized urine sediment examination systems: UriSystem and Kova System.
• To evaluate how these systems categorize cell counts, particularly when dipstick results for blood, nitrite, and leukocyte esterase are negative.
• To assess the impact of standardized systems on the interpretation of microscopic urinalysis.

Main Methods:

• Urine samples from renal patients, hospitalized patients, and a normal population were analyzed.
• Red blood cells and white blood cells were counted using both UriSystem and Kova System.
• Cell counts were categorized into normal, suspicious, or diagnostic levels.
• Analysis included comparison of categorization when dipstick results were negative.

Main Results:

• The UriSystem demonstrated higher clinical relevance in categorizing patient values compared to the Kova System.
• When dipstick tests were negative, the UriSystem more frequently placed cell counts in the 'suspicious' category, prompting further investigation.
• The Kova System showed less sensitivity in identifying potentially abnormal findings under similar conditions.

Conclusions:

• Standardized urine sediment analysis systems significantly impact diagnostic interpretation.
• The UriSystem appears more effective in identifying potentially significant findings that warrant further patient work-up.
• Normal ranges for microscopic urinalysis require re-evaluation based on standardized, clinically relevant systems like the UriSystem.