Serum creatinine is a more specific and sensitive indicator of renal disease than BUN why?

Creatinine is a waste product in your blood that comes from muscle activity. It is normally removed from your blood by your kidneys, but when kidney function slows down, the creatinine level rises .

Urea nitrogen is a normal waste product in your blood that comes from the breakdown of protein from the foods you eat and from your body metabolism. It is normally removed from your blood by your kidneys, but when kidney function slows down, the BUN level rises. BUN can also rise if you eat more protein, and it can fall if you eat less protein. 

Creatine   reflect renal function  bec it spisifcly      excreteted from   kidney  

creatine   not affect by   meat  and food   or liver function  like   BUN     

medical is not my field  so i am sorry.

Serum creatinine is not affected by diet but bun does