What is the prognostic value of albuminuria in CKD?

• A. No prognostic value
• B. Lower albuminuria predicts worse outcomes
• C. Higher albuminuria indicates greater risk of progression and cardiovascular events
• D. Albuminuria only predicts outcomes in diabetics

Answer: (C)

The main idea is that the amount of albumin leaking into the urine tracks kidney damage and cardiovascular risk in CKD. The more albumin present in the urine, the higher the likelihood that kidney function will worsen over time and that cardiovascular events will occur. Albuminuria is a marker of glomerular injury and endothelial dysfunction, so it provides prognostic information beyond what we see with kidney filtration rate alone. This risk increases in a graded fashion: increasing levels of albuminuria correspond to progressively greater risk of progression to end-stage kidney disease and to cardiovascular complications, even when the estimated GFR is similar. Clinically, reducing albuminuria through therapies like renin–angiotensin system blockade and other nephroprotective strategies is associated with slower CKD progression and lower cardiovascular risk, underscoring why higher albuminuria is a sign of worse prognosis.