Just as blood tests require fasting, it is widely recognized that the best urine test is “morning urine”. It’s easy for us to make a request, but it’s a bit tricky for the examiner to do it in practice: “Doctor, I urinate once at 3:00 a.m., once at 5:00 a.m., and then again at 7:00 a.m., which one of these times is the “morning urine”?” “Doctor, I want to pee at 6 a.m., but the hospital doesn’t open until 8 a.m. I can’t hold it in.” Or some people are carrying a bottle of urine in the hospital, many inconveniences. In the end, what is the “good” of morning urine? Urine is blood through the glomerular filtration, tubular reabsorption and excretion of urine and produce, and one of the advantages of morning urine is that, after a whole night of tubular reabsorption, urine has a high degree of “concentration”, and often acidic, urine in the formation of components is not easy to destroy, and more “enough! “It is the most suitable for the examination. The second advantage is that the first time in the morning, not easily affected by diet, exercise and other factors. The disadvantage of morning urine is that the process of retaining it is really troublesome. Hospitalized patients are still good, outpatients often urine specimens stored outside the body for too long, storage conditions are too poor, the same may affect the results. At the same time, keeping urine in the body for too long is thought to cause some destruction of cellular components. Therefore, some doctors have another understanding of “morning urine”. They refer to the first urination in the morning as “overnight urine” and the urine collected 2-3 hours after the “overnight urine” is removed as “morning urine”. Some people also call it “second morning urine”. So what are the implications of not having “morning urine”? First of all, for example, the most common routine urine test, it can reflect many states of urine, is the most basic test; but it is not a very accurate test, many times it is used for “qualitative”. For example, to determine whether the person is “young”, “middle-aged”, or “old”, and does not require precision to the age. In this case, it would not make much sense to deliberately seek the size of the person’s month. Secondly, it depends on the purpose of the test. For example, if you want to check “urine sugar”, it is better to leave urine on an empty stomach. For example, if you want to look at urine protein, it is better to keep urine on an empty stomach. If you want to look at urine protein, morning urine can reduce the effect of activity on urine protein, but it does not make much difference to keep urine at a random time. In some special cases, such as suspected urinary tract infections, urine culture is needed, in order to increase the positive culture rate, even if it is difficult, we have to overcome the difficulties and try to keep the “first urine in the morning”. Doctors are more interested in “clean mid-urine” than “morning urine”. Cleanse the vulva first, then “relieve a little and keep the middle passage”. Avoid external contamination. Also, try to avoid exercising before urinating, and women should avoid menstruation.