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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.
High levels of microalbumin in urine may indicate kidney disease, but it may also be caused by medications, urinary tract infection and fever, according to Mayo Clinic. High levels of creatinine in a urine clearance test may indicate kidney disease, pregnancy, hypothyroidism or carbon monoxide poisoning, according to WebMD. Keep Learning.