There is a reason why drinking less water can make the microalbumin in the urine high. The concentration of microalbumin in the urine depends on the amount of microalbumin and the volume of urine. If the patient drinks less water, the urine will be in a concentrated state and the concentration of microalbumin in the urine will be high. However, even if it is high, there must be a certain range, usually less than 30mg/L. If it is higher than 30mg/L, it should be considered abnormal and we call it microalbuminuria. When it is greater than 300mg/L, it is called massive proteinuria. There is a difference between urine microalbumin and urine protein. In some kidney diseases, a routine urine test in the early stage will reveal a negative urine protein, but a urine microalbumin test will reveal a significant increase. This does not mean that the patient does not have kidney disease, but belongs to the early stage of kidney disease. At this time, timely treatment of the underlying disease and treatment to reduce urine protein can delay the failure of kidney function, which is very significant for patients. How much water you drink has an effect on urine microalbumin, but there has to be a certain range, which gives us a basis for determining whether urine microalbumin is high.