Your kidneys filter almost 200 quarts of blood daily and make approximately two quarts of urine as the waste product. When the kidneys don't work like they should, products in the blood which are supposed to be removed, like the blood urea nitrogen (BUN), and creatinine (Cr) stay in the blood and can be easily measured with a blood test. Other products that are supposed to stay in the blood, like proteins, end up in the urine and can be measured with a urine test.
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11/13/2009
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