THE LABORATORY ASPECTS OF PROTEINURIA

Area of Science:

• Clinical Chemistry
• Urology
• Nephrology

Background:

• Urine test strips may miss cases of proteinuria.
• Accurate detection of proteinuria is crucial for diagnosing kidney conditions.

Purpose of the Study:

• To compare the diagnostic accuracy of urine test strips versus the sulfosalicylic acid test for proteinuria.
• To evaluate the discrepancy in proteinuria detection between the two methods.

Main Methods:

• 1106 subjects were analyzed.
• Urine samples were tested using both standard test strips and the sulfosalicylic acid method.
• Chemical and microscopic urinalysis was performed using the LabUMat-UriSed analyzer.

Main Results:

• Proteinuria was confirmed by sulfosalicylic acid in 96.5% of subjects initially positive by test strip and 85.3% of subjects initially negative.
• A significant number of subjects with negative test strip results but positive sulfosalicylic acid test showed pathological microscopic findings (erythrocytes, leukocytes, bacteria, cylinders).

Conclusions:

• The sulfosalicylic acid test is more sensitive for detecting proteinuria than urine test strips.
• It is recommended to perform the sulfosalicylic acid test in cases with pathological microscopic findings, even if urine test strips are negative for proteinuria.