It is possible to do urine routine before menstruation, if the menstruation has not yet come it will not affect the urine specimen and will not affect the results of the test. However, it is advisable to wash the vulva properly before doing urine routine because the distance between the urethra and vaginal opening of women is very close, which can easily lead to cross infection. If a woman has a lot of leukorrhea, it may also be mixed into the urine to affect the results of the specimen, so you can wash your vulva first, and when you take the specimen, it is recommended to leave the middle urine, which can make the results of the test more realistic. It is possible to do urine routine before menstruation to show that there is no problem, and it is also possible to draw blood for laboratory tests. If it is after menstruation, red cells may appear within the urine routine, and this situation is usually related to the contamination of menstrual blood.