Hematuria
Normal urine contains very small amounts of red blood cells. Uncentrifuged urine can have 0 to 2 red blood cells per high-power field under the microscope. If it exceeds this number, it is urine blood. There are many reasons for hematuria, but they are mainly caused by urinary system diseases, such as renal tuberculosis, nephritis, urinary tract infections, urinary tract stones, and urinary tract tumors.
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