The important item in kidney function is creatinine. There are three main items included in kidney function, the first is creatinine, the second is urea, and the third is uric acid. Creatinine is a product of muscle metabolism, which is filtered by the glomerulus but not reabsorbed by the renal tubules, so it is the most ideal indicator to evaluate kidney function. Urea, on the other hand, is a product of protein metabolism, which passes through glomerular filtration but is partially reabsorbed by the renal tubules, so it is only a rough assessment of kidney function. Uric acid is a product of purine metabolism, and foods rich in purine are mainly beer, animal offal and seafood, and dietary factors can lead to an increase in uric acid. From the above analysis, we can see that the most important indicator of kidney function is creatinine, and in clinical practice, if we want to clarify whether there is abnormality in kidney function, the main item to look at is creatinine, and if creatinine is elevated, it indicates kidney failure.