Urine test with water definitely has an impact. If there are red blood cells and white blood cells in the urine, the number of red blood cells and white blood cells in the urine test will also be reduced after water is added to the urine test; it will also lead to negative urine bilirubin and bilirubinogen test results; the quantitative urine protein test will also be significantly reduced. This situation is mainly seen in many people who have abnormal urine tests and wish to make them normal by diluting the concentration of substances in the urine by mixing with water, thus leading to normal test results. This is generally not recommended, because the urine test is mainly to check whether they have abnormalities, found abnormalities should be treated early.