Sterile pyuria is defined as pyuria without bacterial growth. Which conditions can present with sterile pyuria?

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Multiple Choice

Sterile pyuria is defined as pyuria without bacterial growth. Which conditions can present with sterile pyuria?

Sterile pyuria arises when there are white blood cells in the urine from an inflammatory process, but no bacteria grow on standard culture. Tubulointerstitial nephritis fits this pattern because the inflammation of the renal tubules and interstitium drives leukocyte presence in the urine, yet there isn’t an ongoing bacterial infection in the urinary tract to yield a positive culture. This condition is often drug-related or immune-mediated, and may feature eosinophils in the urine as a clue. In contrast, acute pyelonephritis and a classic bladder infection are infections of the urinary tract driven by bacteria, so their urine cultures are typically positive for bacterial growth. An explicit E. coli bacteriuria finding likewise indicates bacteria are present, not sterile pyuria.

Sterile pyuria arises when there are white blood cells in the urine from an inflammatory process, but no bacteria grow on standard culture. Tubulointerstitial nephritis fits this pattern because the inflammation of the renal tubules and interstitium drives leukocyte presence in the urine, yet there isn’t an ongoing bacterial infection in the urinary tract to yield a positive culture. This condition is often drug-related or immune-mediated, and may feature eosinophils in the urine as a clue.

In contrast, acute pyelonephritis and a classic bladder infection are infections of the urinary tract driven by bacteria, so their urine cultures are typically positive for bacterial growth. An explicit E. coli bacteriuria finding likewise indicates bacteria are present, not sterile pyuria.

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