Although measuring microalbuminuria on a 24 hour specimen is preferred, testing a spot urine specimen can also be performed.


Testing is performed on a spot urine with measurement of both creatinine and albumin.


urinary albumin excretion in µg per mg creatinine =

= (urine albumin per µg/dL) / (urine creatinine in mg/dL)



• Microalbuminuria is defined as urinary albumin excretion rate of 30 – 299 µg albumin per mg creatinine in 2 of 3 samples collected over a 6 month period.


spot urine with µg albumin per mg creatinine


< 30


30 – 299


>= 300

clinical albuminuria


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