Objective To compare Cockcroft-Gault equation,MDRD equation 7,abbreviated MDRD equation,and creatinine clearance(Ccr) in GFR prediction in elderly patients.

• 目的评估Cockcroft-Gault公式、MDRD方程7、简化MDRD方程、肌酐清除率(Ccr)对老年人群肾小球滤过率(GFR)的评定作用。