Cystatin C is a more reliable marker for renal function than creatinine, especially in individuals with high muscle mass, as it is not influenced by muscle mass.

“if you are eating one gram of protein per pound of body weight like i am and you're worried that your creatinine looks a little bit higher than normal you can also get a cystatin c so statin c is not connected with muscle breakdown but you can look at those two tests to tell what your kidney function is”

“if people do see an elevated creatinine when they're eating meat get a cystatin c which is another way to assess your kidney function”

“so statin C's and has not influenced by muscle mass so that's where it picks up some of the imperfections the weight is just oh yeah and if you do both which is by the way if you read the American Kidney guidelines they've actually developed a nice equation where your clearance and we provide this at PhD and I don't know any other lab that does we give you a clearance based on creatinine we give you a clearance based on cystatin C and we give you the best clearance of all based on both of those parameters you segregate by is very different in african-americans so there's a lot more to those EGFR as if you haven't studied it lately there might be going on and if I'm”