The precautions before the routine urine examination are as follows: 1, for young female patients, it is necessary to avoid the menstrual period, and it is required to carry out the routine urine examination about one week after the menstrual period is clean, so as not to affect the results of the examination; 2, it is best to carry out the mid-stage urine examination, to prevent the inflammatory secretions of the urethra or vagina from mixing with the urine, which affects the results of the examination; 3, as far as possible, not to carry out vigorous exercise before the examination, so as not to lead to the emergence of physiologic proteinuria; 4, the fasting for 6-8 hours, but if the starvation time is too long, it will cause the emergence of urinary ketone body, which can be mistaken for a disease.