A urine test with 5 erythrocytes/HPF (high magnification field of view) is abnormal and is considered microscopic hematuria. The normal value of erythrocytes in a urine test is 0-3 cells/HPF, and if this value is exceeded, it is called “hematuria”. Generally speaking, human urine should not contain red blood cells, but occasionally a small number of red blood cells may enter the urine by mistake under the influence of the body’s metabolism. If the patient’s urine erythrocytes are 5/HPF, it may be renal diseases, such as chronic glomerulonephritis, acute nephritis, renal tumors, etc.; it may also be non-nephritic diseases of the urinary system, such as urinary tract infections, urinary stones, urinary tract tumors, etc.; it is also seen in certain physiological conditions such as strenuous activities, Nutcracker Syndrome and so on. There are many other reasons for abnormal red blood cells in urine test, such as coagulation dysfunction disease (hemophilia), certain drugs (such as mercury, cyclophosphamide, warfarin), etc., which can appear in varying degrees of hematuria. Abnormal red blood cells in urine test, it is recommended to consult a regular hospital, follow the doctor’s instructions to improve the relevant examination and standardized treatment.