There are two, four and five kidney function tests, the cost of these tests are different, and there may be differences in charges from one medical unit to another, even for the same test. The two renal function tests are mainly urea nitrogen and creatinine, and the cost of the test is about$27. Renal function four mainly focuses on urea nitrogen and creatinine as well as uric acid and carbon dioxide binding capacity, and costs about$45. And renal function five increases the glomerular filtration rate, which may cost about$70. It is better to check the five items of kidney function to make a preliminary judgment whether there is abnormal kidney function, whether there is high uric acid, and what is the glomerular filtration rate, so that the most accurate judgment can be made.