The possible causes of elevated red blood cell counts found in routine urine tests are as follows: 1. Glomerulonephritis. 2. Infectious diseases in the urinary system, which can cause changes such as congestion, edema and erosion of the urinary tract mucosa, when a small number of red blood cells are mixed in the urine and show elevated counts through urine sediment or routine urine tests, usually accompanied by urinary frequency, urinary urgency, painful urination and other urinary tract irritation symptoms, which require further urine culture tests to confirm the diagnosis. 3. 3. The presence of stones in the urinary tract can cause mucosal rupture at the site of the stones, which can result in bleeding mixed in the urine and elevated red blood cell counts, and may be accompanied by pain at the site of the stones, such as lumbago or abdominal pain, which needs to be ruled out by ultrasound examination of the urinary tract. 4. Hematuria caused by urological tumors. 5. Dysfunction can cause bleeding in the urinary tract, except for an increased number of red blood cells in the urine, which can also be seen as petechiae and ecchymosis under the skin or accompanied by bleeding gums, etc. Further coagulation tests are needed to clarify.