 - A Creatinine clearance CLcr 80 millilitre per minute mLmin as determined by Cockcroft-Gault equation where age is in years, weight Wt is in kg, and serum creatinine Scr is in units of milligram decilitre mgdL; CLcr mLmin 140 - age Wt 72 Scr times 0.85 if female. 