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Urinalysis is a laboratory examination of urine for various cells and chemicals, such as red blood cells, white blood cells, infection, or excessive protein. Urinalysis breaks down the components of urine to check for the presence of drugs, blood, protein, and other substances. Blood in the urine (hematuria) may be the result of a benign (noncancerous) condition, but it can also indicate an infection or other problem. High levels of protein in the urine (proteinuria) may indicate a kidney or cardiovascular problem.