Any condition that causes reduced kidney function over a period of time. CKD is present when a patient’s glomerular filtration rate remains below 60 milliliters per minute for more than 3 months or when a patient’s urine albumin-to-creatinine ratio is over 30 milligrams (mg) of albumin for each gram (g) of creatinine (30 mg/g). CKD may develop over many years and lead to end-stage renal disease.