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Blood in urine may be a sign of a serious medical disorder so it does require medical investigation and it should not be ignored. The most common causes of hematuria are kidney and bladder stones, trauma to the kidney, bladder, or other parts of the genitourinary tract.
1 Urine tests. 2  Even if your bleeding was first discovered through urine testing (urinalysis), you're likely to have another test to see if your urine still contains red blood cells. 3  Urinalysis can also check for urinary tract infection or the presence of minerals that cause kidney stones. Physical exam, which includes a discussion of your medical history. 2  Urine tests. 3  Even if your bleeding was first discovered through urine testing (urinalysis), you're likely to have another test to see if your urine still contains red blood cells.