Which laboratory value supports a diagnosis of pyelonephritis?

Which laboratory value supports a diagnosis of pyelonephritis?

• A. Pyuria
• B. Proteinuria
• C. Hematuria
• D. Bacteriuria

Answer: (A)

Pyelonephritis is an infection of the kidney that triggers an inflammatory response in the urinary tract. This response brings white blood cells into the urine, producing pyuria. Detecting white blood cells in the urine (or a positive leukocyte esterase on a dipstick) directly reflects the inflammatory process caused by bacterial infection in the kidneys, making pyuria the most supportive lab finding for this condition. Proteinuria and hematuria can occur with kidney issues but are not specific to infection, and bacteriuria alone indicates bacteria present but doesn’t confirm the inflammatory response characteristic of pyelonephritis.

Pyelonephritis is an infection of the kidney that triggers an inflammatory response in the urinary tract. This response brings white blood cells into the urine, producing pyuria. Detecting white blood cells in the urine (or a positive leukocyte esterase on a dipstick) directly reflects the inflammatory process caused by bacterial infection in the kidneys, making pyuria the most supportive lab finding for this condition.

Proteinuria and hematuria can occur with kidney issues but are not specific to infection, and bacteriuria alone indicates bacteria present but doesn’t confirm the inflammatory response characteristic of pyelonephritis.