Microscopic examination of 3-5 red blood cells is an abnormal state. Normally, there are also red blood cells in urine, but the amount is relatively small and is mainly observed by applying a microscope. Microscopic high magnification field of view to observe less than 3, it is a normal state, if more than 3, it is abnormal. If the microscopic examination of red blood cells is 3-5, although it belongs to an abnormal state, but the amount is relatively small, this situation only needs dynamic review of urinary routine can be. If the patient does not have edema, hypertension, or urine protein during the review process, this situation does not require special treatment. If, during the review, more and more red blood cells are found in the urine, and these symptoms mentioned above also appear, suggesting a bad performance, it is necessary to actively look for the causes, which are more common, such as chronic nephritis and lupus nephritis. It needs to be dealt with according to the specific cause and then from the cause.