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What It Is. A microalbumin-to-creatinine ratio urine test involves measuring the amount of a protein called albumin in the urine (pee). The amount of urine albumin is compared with the quantity of a waste product in the urine called creatinine.
In a properly functioning body, albumin is not normally present in urine because it is retained in the bloodstream by the kidneys. Microalbuminuria can be diagnosed from a 24-hour urine collection (between 30â300 mg/24 hours) or, more commonly, from elevated concentrations in a spot sample (30 to 300 mg/L).Both must be measured on at least two of three measurements over a two-to three-month period.icroalbuminuria can be diagnosed from a 24-hour urine collection (between 30â300 mg/24 hours) or, more commonly, from elevated concentrations in a spot sample (30 to 300 mg/L).