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Single-void urine samples can be used to estimate quantitative microalbuminuria
Abstract:
The excretion of small quantities of urinary albumin (microalbuminuria) may predict renal failure in diabetes. The measurement of microalbuminuria with radioimmunoassays has been based on 24-h, overnight, and 3- to 4-h collections. To determine whether single-void urine samples can be used to estimate 24-h excretion, we compared the results of 24-h outpatient urine collections with single-void samples corrected for creatinine from diabetic and nondiabetic subjects. The overall correlation of single-void sample results expressed as microgram albumin per milligram creatinine with 24-h excretion (mg/24 h) was excellent (r = .82, P less than .001). More important, in the diabetic patients the sensitivity and specificity of detecting 24-h microalbuminuria in the abnormal range were at least 94 and 96%, respectively. Single-void urine specimens adjusted for creatinine discriminate between normal and abnormal levels of microalbuminuria, as determined in 24-h urine collection, with high specificity and sensitivity.
Insights
Single-void urine samples, when corrected for creatinine, accurately estimate 24-hour microalbuminuria excretion in diabetic patients. This method offers high sensitivity and specificity for detecting kidney disease risk.
Area of Science:
- Nephrology
- Diabetology
- Clinical Chemistry
Background:
- Microalbuminuria, a predictor of renal failure in diabetes, is typically measured using timed urine collections.
- Existing methods for microalbuminuria assessment involve 24-hour, overnight, or 3- to 4-hour urine samples.
- Radioimmunoassays are commonly employed for microalbuminuria quantification.
Purpose of the Study:
- To evaluate the utility of single-void urine samples for estimating 24-hour microalbuminuria.
- To determine if creatinine-corrected single-void samples can reliably predict abnormal microalbuminuria levels.
Main Methods:
- Comparison of 24-hour urine collections with single-void urine samples.
- Correction of single-void sample results using creatinine levels.
- Analysis of data from both diabetic and nondiabetic subjects.
- Calculation of correlation coefficients, sensitivity, and specificity.
Main Results:
- An excellent overall correlation (r = .82, P < .001) was observed between single-void and 24-hour microalbuminuria excretion.
- In diabetic patients, sensitivity and specificity for detecting abnormal 24-hour microalbuminuria reached at least 94% and 96%, respectively.
- Creatinine-adjusted single-void samples effectively discriminated normal from abnormal microalbuminuria levels.
Conclusions:
- Single-void urine specimens, adjusted for creatinine, serve as a reliable alternative for assessing 24-hour microalbuminuria.
- This approach provides high sensitivity and specificity, simplifying the detection of diabetic nephropathy.
- The findings support the use of single-void samples in routine clinical practice for microalbuminuria screening.