creatinine serum uln times institutional concentration days prior equal levels 
creatinine upper limit normal times institutional serum uln institution age 
amylase lipase uln serum normal institutional days registration prior limits 
potassium limits normal meq serum range institutional institution wnl supplementation 
limits creatinine normal institutional upper serum uln times troponin days 
limits bilirubin normal upper total uln serum institutional times ast 
renal creatinine function uln serum adequate times defined normal mg