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Creatinine is the waste product of creatine, which the muscles use to make energy. Typically, creatinine travels in the blood to the kidneys where it leaves the body in the urine. High levels in the blood might indicate that the kidneys are not working correctly. A serum creatinine test measures the level of creatinine in the blood and provides an estimate of how well the kidneys filter (glomerular filtration rate). A creatinine urine test can measure creatinine in the urine.
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