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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.
Urine Albumin (mg/dL) / Urine Creatinine (g/dL) = UACR in mg/g â Albumin excretion in mg/day. UACR is a ratio between two measured substances. Unlike a dipstick test for albumin, UACR is unaffected by variation in urine concentration. Albuminuria is present when UACR is greater than 30 mg/g and is a marker for CKD.