ALB and diabetic kidney disease: The urinary albumin excretion rate (UAER) is used to clinically categorize diabetic kidney disease into the following stages: normoalbuminuria (UAER < 30 mg/g creatinine), microalbuminuria (UAER 30-300 mg/g) or macroalbuminuria (UAER > 300 mg/g) [7].