Using both creatinine and cystatin C to calculate eGFR provides a more accurate assessment of renal function, with specific considerations for African Americans.

“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”