Urine routine test does not require fasting, but fasting morning urine test is the best. Urine routine is a frequent examination of nephrology, the main purpose of this program is to rule out the presence of nephritis and urinary tract infection. If there is nephritis, urine protein, red blood cells or occult blood will be found in the urine routine. If there is a urinary tract infection, there will be white blood cells, possibly accompanied by red blood cells and so on. Theoretically speaking, if there are these diseases, at any time of the day to check the urine routine will appear corresponding abnormalities, so the routine examination of urine does not require absolute fasting, but fasting morning urine examination is better, because after a night of deposition, the test results are more accurate. In the urine routine, retaining morning urine is a requirement, another requirement is to take the mid-range urine, because not retaining the mid-range urine is easy to be contaminated.