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n. the fluid excreted by the kidneys, which contains many of the body’s waste products. It is the major route by which the end-products of nitrogen metabolism – urea, uric acid, and creatinine – are excreted. The other major constituent is sodium chloride. Over 100 other substances are usually present, but only in trace amounts. Analysis of urine (see urinalysis) is commonly used in the diagnosis of diseases (for example, there are high levels of urinary glucose in diabetes and of ketone bodies in ketonuria); immunological analysis of urine is the basis of most pregnancy tests.

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