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A urea test, also called a BUN test, measures the amount of urea nitrogen in your blood. Urea is a waste product generated when your body breaks down protein. The liver produces it, and the kidneys normally filter it out

Serum Creatinine measures the level of creatinine, a waste product produced by normal muscle breakdown, in your blood. Since the kidneys filter creatinine from the blood, this test is one of the most common ways to assess how well your