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Table 1—

Definitions of abnormalities in albumin excretion

CategorySpot collection (μg/mg creatinine)24-h collection (mg/24 h)Timed collection (μg/min)
Normal <30 <30 <20 
Microalbuminuria 30–299 30–299 20–199 
Clinical albuminuria ≥300 ≥300 ≥200 
CategorySpot collection (μg/mg creatinine)24-h collection (mg/24 h)Timed collection (μg/min)
Normal <30 <30 <20 
Microalbuminuria 30–299 30–299 20–199 
Clinical albuminuria ≥300 ≥300 ≥200 

Because of variability in urinary albumin excretion, two of three specimens collected within a 3- to 6-month period should be abnormal before considering a patient to have crossed one of these diagnostic thresholds. Exercise within 24 h, infection, fever, congestive heart failure, marked hyperglycemia, marked hypertension, pyuria, and hematuria may elevate urinary albumin excretion over baseline values.

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