Which statement best describes the prognostic significance of proteinuria in chronic kidney disease?

• A. Higher proteinuria indicates more glomerular injury and faster progression.
• B. Proteinuria has no relation to CKD progression.
• C. Lower proteinuria is always associated with worse renal outcomes.
• D. Reduction of proteinuria with therapy does not affect the rate of CKD progression.

Answer: (A)

Proteinuria in chronic kidney disease serves as a prognostic indicator because the amount of protein leaking into the urine reflects how severely the glomerular filtration barrier is damaged and how quickly kidney function is likely to decline. When there is more protein in the urine, it signals greater glomerular injury, and these proteins can promote tubular inflammation and scarring, accelerating progression to kidney failure. Treatments that successfully reduce proteinuria, such as ACE inhibitors or ARBs, are associated with slower CKD progression, showing that lowering proteinuria can improve outcomes. Therefore, the statement that higher proteinuria indicates more glomerular injury and faster progression is the best description.