Table 1—

Definitions of abnormalities in albumin excretion

Category24-h collection (mg/24 h)Timed collection (μg/min)Spot collection (μg/mg creatinine)
Normal<30<20<30
Microalbuminuria30–29920–19930–299
Clinical albuminuria≥300≥200≥300
  • 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.