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Lab Manual for Moffitt-Long and Mount Zion

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Albumin (Microalbumin), spot urine

Item Value
Approval req'd? No
Available Stat? No
Test code AUR
Performed by Immunology
In House Availability Tuesday, Thursday, Saturday (day shift)
Method Nephelometry
Collection Instructions First A.M. sample preferred for random urine.
Container type Urine cup
Amount to Collect 10-20 mL
Sample type Random urine
Preferred volume 2 mL urine
Min. Volume 0.5 mL urine
Processing notes Aliquot 2 mL, note that sample is a "spot" or random urine sample. Order AUR and CRUR.
Units mg/g creatinine
Normal range Random urine:
Normal < 30 mg/g creatinine
Microalbuminuria 30-299 mg/g creatinine
Nephropathy > 300 mg/g creatinine
Synonyms Microalbuminuria
Turn around times 1-3 days
Additional information A creatinine is performed on the same sample to calculate the result and will be reported and billed separately.

Diabetes mellitus is one of the commonest causes of end-stage renal disease. The National Kidney Foundation recommends that diabetics > 12 years old be tested yearly for microalbuminuria if the rate of excretion is within normal limits (Amer J Kid Dis. 1995;25:107). The Diabetes Coalition of California recommends annual testing for microalbuminuria beginning 5 years after the diagnosis of type I diabetes mellitus and beginning at diagnosis of type II disease. The cost benefit of these strategies are not established.

Transient increases in urinary albumin excretion are seen with heavy exercise, urinary infection, acute febrile illness, heart failure and following the administration of NSIADs or ACE inhibitors, all of which should be avoided during screening. Because of the difficulty in collecting and accurately timing 24 hour samples, a spot collection is recommended and the albumin excretion is normalized for creatinine excretion, correcting to some extent for the diurnal fluctuation in urinary output. Abnormalities should be verified by a repeatedly positive assay within 6-12 weeks before a diagnosis of diabetic microalbuminuria or diabetic nephropathy is made.
CPT coding 82043
LOINC code 14959-1
Last Updated 3/24/2013 7:12:13 PM
Entry Number 662

If you have additional questions regarding this test, please call: 415-353-1667

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