Which statement best describes the relationship between urine albumin-to-creatinine ratio and CKD risk?

• A. Lower UACR indicates higher risk.
• B. UACR has no clinical significance.
• C. Higher UACR indicates higher risk.
• D. UACR measures hydration status.

Answer: (B)

Understanding how urine albumin-to-creatinine ratio (UACR) relates to CKD risk is key. UACR measures how much albumin is leaking into the urine relative to creatinine, which normalizes for urine concentration. When the kidney’s filtering barrier is damaged, albumin slips into the urine— this is called albuminuria. Even small amounts can indicate ongoing kidney injury and a higher risk of CKD progression and cardiovascular events.

As UACR increases, the risk rises. Normal UACR is typically under 30 mg/g. A range called microalbuminuria (about 30–300 mg/g) signals early kidney damage, and values above 300 mg/g indicate more substantial albumin leakage. These elevations are clinically significant because they guide prognosis and management, including therapies that can reduce albuminuria and slow CKD progression. Hydration status can affect urine concentration, but UACR specifically reflects albumin leakage due to kidney injury, not hydration.