The most commonly used criteria are the ones that characterize CKD categories: An abnormal function defined by a decreased glomerular filtration rate (GFR, <60 mL/min/1.73 m2, that is, G categories G3–G5) or evidence of kidney damage such as albuminuria (albumin excretion rate ≥ 30 mg/24 h; urinary albumin creatinine ratio ≥ 30 mg/g, that is, A categories A2 or A3). This evidence concerns the gene ALB and chronic kidney disease.