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[The practical assessment of micro-albuminuria as a marker for beginning diabetic nephropathy in: which urine
F Caduff1, G A Spinas, H Engler
1Abteilung für Endokrinologie und Stoffwechsel, Universitätskliniken, Kantonsspital Basel.
Abstract:
Microalbuminuria, i.e. elevated urinary albumin excretion rate between 20 and 200 micrograms/min, is a strong predictor of subsequent overt diabetic nephropathy. Screening for microalbuminuria is essential, since it has been shown that development of overt nephropathy can be delayed or even prevented by therapeutic measures such as strict metabolic control, early aggressive antihypertensive treatment, or restriction of protein intake. Several urine collection methods for the measurement of microalbuminuria have been proposed. In a prospective study with 40 diabetic outpatients we have compared albumin excretion in urine collected over 24 h, during a timed overnight period, and in a spot urine sample collected at random while the patient attended the outpatient clinic. In addition, the reproducibility of the three urine collection methods was assessed. For this purpose, each patient underwent 3 consecutive collections at an interval of at least 4 weeks. Our data indicate that calculation of an albumin/creatinine quotient in a spot urine probe is a reliable screening test for microalbuminuria. If this quotient is increased (greater than 2), timed overnight collection should be performed.
Insights
Screening for microalbuminuria (elevated urinary albumin excretion) is crucial for diabetic nephropathy prevention. A spot urine albumin/creatinine test is a reliable initial screening method for early detection in diabetic patients.
Area of Science:
- Nephrology
- Diabetology
- Clinical Chemistry
Background:
- Microalbuminuria is a key predictor of diabetic nephropathy.
- Early detection and intervention can delay or prevent nephropathy progression.
- Effective screening methods are vital for diabetic patient management.
Purpose of the Study:
- To compare the reliability and reproducibility of different urine collection methods for microalbuminuria screening.
- To evaluate 24-hour collection, overnight collection, and spot urine samples.
- To determine the most effective screening approach for early diabetic nephropathy detection.
Main Methods:
- Prospective study involving 40 diabetic outpatients.
- Comparison of albumin excretion using 24-hour, overnight, and random spot urine samples.
- Assessment of reproducibility through three consecutive collections per patient over time.
Main Results:
- The albumin/creatinine quotient in a spot urine sample demonstrated reliability as a screening test for microalbuminuria.
- Timed overnight collection is recommended if the initial spot urine quotient is elevated (greater than 2).
Conclusions:
- Spot urine albumin/creatinine quotient is a practical and reliable screening tool for microalbuminuria in diabetic patients.
- Positive spot test results warrant further investigation with timed overnight urine collection.
- This approach facilitates early identification and management of diabetic nephropathy risk.