Most of the urine of uremic patients is colorless and transparent, and then the urine color of uremic patients does not need to be combined with different stages to judge. Sometimes when the urine protein content is relatively high or accompanied by inflammation, the urine is more turbid, so purely from the color of the urine can not judge whether to suffer from uremia. Uremia patients can pay attention to their urine volume and color, the urine volume may be reduced; and renal failure patients, its daytime and nighttime urine volume will be different, such patients tend to increase the amount of nocturnal urine. Therefore, this time you need to pay attention to observe the 12-hour urine volume from getting up at 8:00 in the morning to 8:00 in the evening, and the 12-hour urine volume from 8:00 in the evening to getting up in the morning of the next day. Through observation, it can be learned that the urine volume at night is more than the daytime urine volume, reflecting the uremic patients with urine concentration and dilution function of the decline.