The “24-hour urine volume” in the 24-hour urine protein quantification means that the first urine in the morning is cleared, and then the second urine is kept from the beginning. Look at what time it is, and keep track of the time until the next day, which is 24 hours. Put all the urine from each of these 24 hours into a container, mix it well, and then take 100-200 ml from the middle and take it to the hospital for testing. Under normal circumstances, the glomerular filtration membrane can only pass substances with a small molecular weight. Normal people generally have 40-80 mg of protein in their urine each day, and this level is generally undetectable with the qualitative protein test method. With certain diseases, protein leakage increases and a positive urine protein test can be performed. Therefore, the results reported by the qualitative urine protein test are rough, and the quantitative 24-hour urine protein test can accurately measure the amount of protein excreted in the urine.