Which statement about microalbuminuria as a screening marker for diabetic nephropathy is most accurate?

• A. It Represents Microalbuminuria Excretion in the Range 0–30 mg/day
• B. It Reflects Albumin Excretion in the Range 30–300 mg/day
• C. It Is Not Affected by Blood Glucose Control
• D. It Is Only A Late-Stage Marker

Answer: (B)

Microalbuminuria signals early kidney involvement in diabetes. It is defined by albumin excretion in the urine in the range of 30–300 mg per day (often measured as an albumin-to-creatinine ratio of 30–300 mg/g on a spot sample). This range sits between normal/slightly elevated levels (<30 mg/day) and overt proteinuria (>300 mg/day). Detecting this level is important because it indicates increased glomerular permeability from diabetic microvascular injury and identifies patients who should receive early interventions to protect kidney function, such as optimizing glycemic control and using ACE inhibitors or ARBs. Blood glucose control does influence the risk and progression of nephropathy, so microalbuminuria is not independent of glycemic status. It is an early marker, not a late-stage one, which is why the statement describing it as a late marker is inaccurate.