Table 1.

IRIS staging guidelines

IRIS stage	Clinical features	Creatinine and urine specific gravity (USG)
1	Inadequate urine concentrating ability in the absence of azotaemia	Creatinine <140 µmol/l; USG <1.038
2	Mild clinical signs associated with CKD	Creatinine 140–250 µmol/l; USG <1.030
3	Many clinical signs of CKD	Creatinine 251–440 µmol/l; USG <1.020