The price of kidney function test may vary according to different regions and hospitals, and it also varies greatly according to the number of items of kidney function test. If only three kidney function tests are done, including blood creatinine, urea nitrogen and uric acid, the cost is about 50-80 RMB. However, if there are more items to be checked, in addition to creatinine, urea nitrogen and uric acid, albumin, total protein and serum β2-microglobulin are also checked, the total cost will be about RMB 100-200. The kidney function test usually requires blood sampling on an empty stomach, and it is best to start a light diet 3 days before the test. If there is an increase in blood creatinine and urea nitrogen, it often indicates the presence of renal insufficiency, so it is necessary to go to the hospital for timely diagnosis and clarification of the cause.