Drinking more water before a routine urine retest will not improve the passing rate in the vast majority of cases, but for urinary tract infections, drinking a lot of water before the test may dilute certain white blood cells, and the judgment of such diseases will be somewhat biased. Routine urine retesting may be due to factors such as contamination of the urine specimen during the first examination, untimely delivery and other factors that affect the test results, or it may be due to the detection of pathological changes such as infections that require further confirmation and observation of whether the test results are still abnormal. In addition, in some cases, it may also be due to the need to understand the effectiveness of the treatment of the disease, so that the results of the retest can be used to adjust the treatment plan. A common urine routine abnormality is elevated white blood cells, which mainly indicates urinary tract infection, with the main symptoms being urinary urgency, frequency, painful urination and difficulty in urination. Doctors may advise patients to drink more water and urinate more often, but mainly to help anti-infection treatment, not to be able to cover up the disease before the retest and improve the rate of passing the urine routine. The pathological factors caused by abnormal urine routine, such as nephrotic syndrome, various types of nephritis, gout, poisoning and other diseases, after the diagnosis of the disease, by drinking a lot of water can not change the urine pH, urine protein, urine sugar, white blood cells, pus cells and other test results, there is no large amount of water can improve the passing rate of the situation. In addition, there are some patients who fail the urine test due to drinking alcohol, taking prohibited drugs, etc., and even by drinking a lot of water, it will not cause fundamental changes to the test results. Therefore, it is recommended that in order to improve the retest rate and facilitate the doctor’s correct judgment of the disease and understanding of the progress of the disease, patients should try to avoid drinking a lot of water before the urine routine retest. This may not only affect some test indicators, but also cause bias in the doctor’s judgment of some diseases, thus delaying early and active treatment, which is detrimental to the patient’s possible disease control.