Definition of Microalbuminuria

Reviewed on 3/29/2021

Microalbuminuria: 1. Generally, a subtle increase in the urinary excretion of the protein albumin that cannot be detected by a conventional assay. In diabetes, microalbuminuria is an early sign of diabetic kidney disease.

2. Specifically, the excretion of greater than 30 mg and less than 300 mg a day of albumin in the urine. The normal urinary albumin is less than 30 mg per 24 hours and 300 mg or more of urinary albumin per day is considered gross albuminuria.

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