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Comparison of urine specific gravity values from total-solids refractometry and reagent strip method
Summary
Urine specific gravity measurement using a reagent strip is a suitable screening tool but lacks precision compared to a TS meter. Results showed statistical differences, though correlations existed, indicating limitations for accurate readings.
Area of Science:
- Clinical Chemistry
- Urinalysis
- Diagnostic Testing
Background:
- Accurate urine specific gravity measurement is crucial for assessing kidney function and hydration status.
- Traditional methods like the TS meter offer precise readings, while reagent strips provide a rapid screening option.
Purpose of the Study:
- To compare the accuracy of urine specific gravity measurements obtained from a TS meter versus a reagent strip.
- To evaluate the reliability of reagent strips across different urine protein concentrations.
Main Methods:
- 561 urine samples were analyzed for specific gravity using both a TS meter and a standard reagent strip.
- Samples were categorized into two groups based on protein content: <2+ and ≥2+ protein.
Main Results:
- Statistically significant differences (p<0.01) in specific gravity values were observed between the TS meter and reagent strip in both groups.
- Strong positive correlations were found: r=0.84 (p<0.001) for samples with <2+ protein and r=0.73 (p<0.001) for samples with ≥2+ protein.
Conclusions:
- Urine reagent strips are adequate for preliminary screening of specific gravity.
- However, reagent strips should not be relied upon for precise specific gravity measurements, especially in samples with higher protein concentrations.