What finding on urinalysis and creatinine assessment would suggest kidney involvement due to vasculitis?

What finding on urinalysis and creatinine assessment would suggest kidney involvement due to vasculitis?

• A. Normal urinalysis and creatinine
• B. Low urine protein
• C. No blood in urine
• D. Protein and blood in urine when vasculitis affects the kidneys

Answer: (D)

Vasculitis that involves the kidneys causes glomerulonephritis, where inflammation damages the glomerular filtration barrier. This makes the kidney leak both red blood cells and protein into the urine, so urinalysis would show blood (often microscopic) and proteinuria. As kidney function declines from this inflammation, serum creatinine rises and the GFR falls, reflecting impaired filtration. So the finding of both protein and blood in the urine, with a creatinine assessment that indicates reduced kidney function, best signals kidney involvement due to vasculitis. In contrast, a normal urinalysis, low protein, or no blood in the urine would not suggest glomerular vasculitis.

Vasculitis that involves the kidneys causes glomerulonephritis, where inflammation damages the glomerular filtration barrier. This makes the kidney leak both red blood cells and protein into the urine, so urinalysis would show blood (often microscopic) and proteinuria. As kidney function declines from this inflammation, serum creatinine rises and the GFR falls, reflecting impaired filtration. So the finding of both protein and blood in the urine, with a creatinine assessment that indicates reduced kidney function, best signals kidney involvement due to vasculitis. In contrast, a normal urinalysis, low protein, or no blood in the urine would not suggest glomerular vasculitis.