A .Ccr50~70%,血清肌酐(Scr)<1.5mg/dl
B .Ccr25~50%,血清肌酐(Scr)1.5~2.5mg/dl
C .Ccr10~25%,血清肌酐(Scr)2.5~5mg/dl
D .Ccr<10~25%,血清肌酐(Scr)>5mg/dl
E .Ccr<5%,血清肌酐(Scr)>10mg/dl