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Microalbuminuria in clinical practice

M J McKenna1, C Arias, C S Feldkamp

  • 1Division of Endocrinology and Metabolism, Henry Ford Hospital, Detroit, Mich. 48202.

Archives of Internal Medicine
|September 1, 1991
PubMed

Insights

Early detection of diabetic nephropathy is valuable. Quantitative immunoassay testing for albumin excretion rate in a 24-hour urine sample is preferred over semiquantitative tests for diagnosing kidney disease in diabetes patients.

Area of Science:

  • Nephrology
  • Endocrinology
  • Clinical Chemistry

Background:

  • Diabetic nephropathy is a major complication of diabetes mellitus.
  • Early detection of diabetic nephropathy is crucial for preventing progressive renal disease.
  • Albuminuria is a key indicator of early diabetic nephropathy.

Purpose of the Study:

  • To evaluate the diagnostic value of albumin excretion rate (AER) for early diabetic nephropathy detection.
  • To compare quantitative immunoassay methods with semiquantitative tests for AER measurement.
  • To identify predictors of AER in patients with diabetes mellitus.

Main Methods:

  • Albumin excretion rate was determined in 276 patients using quantitative immunoassay on single 24-hour urine samples.
  • Statistical analysis was performed to identify predictors of AER.
  • Results were categorized into normal, microalbuminuric, and macroproteinuric ranges.

Main Results:

  • 66% of patients had normal AER, 27% were in the microalbuminuric range, and 7% were in the macroproteinuric range.
  • Hypertension and glycosylated hemoglobin levels predicted AER in type 1 diabetes.
  • Years since diagnosis predicted AER in type 2 diabetes.
  • A semiquantitative test showed limited diagnostic value.

Conclusions:

  • Routine testing for early diabetic nephropathy provides valuable clinical information.
  • Quantitative immunoassay determination of AER from a single 24-hour urine sample is the preferred method.
  • Optimal screening frequency and thresholds for progressive renal disease require further investigation.

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