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How is Kidney Failure Diagnosed?

Kidney failure is most often found with a blood test called a "creatinine level." Creatinine is a molecule made by your muscles. A normal kidney will remove extra creatinine from the blood stream and get rid of it in urine. More creatinine in the blood is a sign that the kidneys aren't cleaning the blood as well as they should. This test can spot something is wrong before a patient with kidney failure feels sick.