creatinine clearance min ml serum mg dl estimated uln crcl 
mm longest measured measurable accurately lesion dimension diameter ct recorded 
creatinine calculated clearance min ml serum measured uln crcl mg 
mg dl creatinine serum years age maximum male calcium female 
filtration glomerular rate min ml gfr creatinine estimated clearance renal 
creatinine institutional clearance normal levels min ml uln upper calculated 
creatinine gault cockcroft clearance min ml formula calculated using equation