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Reference Range. Microalbuminuria is defined as excretion of 30â300 mg of albumin per 24 hours (or 20â200 mcg/min or 30â300 mcg/mg creatinine) on 2 of 3 urine collections.The detection of low levels of albumin excretion (microalbuminuria) has been linked to the identification of incipient diabetic kidney disease. ratio of albumin (mcg/L) to creatinine (mg/L) of less than 30 is normal; a ratio of 30-300 signifies microalbuminuria and values above 300 are considered as macroalbuminuria.
However, we know that GFR physiologically decreases with age, and in adults older than 70 years, values below 60 mL/min/1.73 m 2 could be considered normal. Following the âprognostic wayâ, the fixed cut-off of 60 mL/min/1.73 m 2 has been retained in the K-DIGO guidelines.onclusions. The K-DIGO recommendations define GFR below 60 mL/min/1.73 m 2 as a disease, regardless of age. This recommendation is based on eGFR and on the higher risk of mortality associated with eGFR below 60 mL/min/1.73 m 2 [ 5 ].