Urine concentration and dilution function test

The urine concentration and dilution function test is an auxiliary test method for checking whether the urination function is normal. The urine concentration dilution test is to observe the ability of the distal renal tubule to concentrate urine in the state of water shortage. The function of the urine concentration of the distal tubule can be understood by measuring the specific gravity of the urine. Clinically, urine concentration and dilution function tests generally use the method of measuring the weight of day and night urine. However, it is often not correct to judge the concentration and dilution function of the renal tubules based on the specific gravity of the urine. Therefore, in recent years, some people advocate the use of pure water to remove them. Rate to evaluate kidney concentration and dilution functions. The dilution test is a method of testing the water balance in the body. Basic Information Specialist classification: urinary examination classification: urine / kidney function test Applicable gender: whether men and women apply fasting: not fasting Tips: 嘱 patients drink a certain amount of water, determine the amount of urine and specific gravity. Normal value Under normal circumstances, the human body can adjust the concentration and dilution of urine according to the balance of water and liquid in the body, and maintain the balance of water and salt in the body by discharging concentrated urine or diluting urine. Clinical significance Abnormal results: analysis of urine concentration dilution test results Under normal circumstances, the 24-hour urine volume is 1000-2000ml, the ratio of urine volume to nocturia is 3-4/1, 12-hour nocturia should not exceed 750ml, the highest urine weight Should be above 1.020, the difference between the highest urine specific gravity and the lowest urine specific gravity should not be less than 0.009. Exceeding the above range is an abnormal result. People who need to be examined: patients with kidney disease. Precautions Taboo before check: Maintain normal sleep and diet. Requirements for examination: 嘱 patients drink a certain amount of water, determine the amount of urine and specific gravity. The dilution test is mainly used to judge the filtration effect of glomeruli, and the loss of dilution function is later than the occurrence of abnormal concentration function. This test is abnormal, more common in glomerular lesions or decreased renal blood flow, more pronounced in nephritis oliguria and edema. Inspection process There are two test methods for urine concentration and dilution: (1) Mosenthal method: normal consumption during the test, the water content of each meal should not exceed 500-600ml. No more liquids other than a normal diet. At 8 o'clock in the morning, urinating was abandoned. Within 12 hours during the day, urine was given every 2 hours for a total of 6 times. Collect 12 hours of urine at night. (2) VolHard method: urinating at 8 o'clock in the morning, and leaving the urine sample once every 3 hours for a total of 4 times. The urine was collected for 12 hours at night, and the urine volume and specific gravity were accurately determined to determine the function of the concentrated urine in the distal tubule. Not suitable for the crowd Inappropriate people: Generally, there is no suitable for the crowd. Adverse reactions and risks No related complications or hazards.

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