The three kidney function tests are 90 yuan a time, in the clinic when patients have edema or elevated blood pressure, especially in young patients, there is also a situation when the physical examination, will often perform kidney function tests. The kidney function test items are not very expensive, each time is 90 yuan, the main items are creatinine, urea and uric acid. Before the kidney function test, you need to pay attention to some things: first, try not to eat, try to fasting test, although the kidney function test is not forced to require fasting, but fasting test for the test results is the smallest impact. If you eat a meal, especially if you eat food containing more protein or lean meat, it will cause the urea and creatinine to be affected. Second, do not do too strenuous exercise on the day of the kidney function test or the day before, because doing too strenuous exercise does not have much effect on urea, but the effect on creatinine is relatively large.