A urine sample test shows leukocytes and nitrite positive; what is the most likely diagnosis?

A urine sample test shows leukocytes and nitrite positive; what is the most likely diagnosis?

• A. Neoplasm
• B. Bacterial infection
• C. Diabetes mellitus
• D. Renal failure

Answer: (B)

Leukocytes in urine indicate inflammation in the urinary tract, usually from infection. Nitrite positivity appears when certain bacteria reduce nitrates to nitrites, a process common among urinary pathogens like E. coli. When both findings are present, it strongly points to a bacterial urinary tract infection rather than other conditions. Neoplasms don’t typically cause nitrite positivity, diabetes mellitus isn’t defined by this nitrite/leukocyte pattern (it shows glucose or ketones rather than infection signs), and renal failure presents with kidney-specific dysfunction rather than this combination. So the pattern you’re seeing is most consistent with a bacterial infection of the urinary tract.

Leukocytes in urine indicate inflammation in the urinary tract, usually from infection. Nitrite positivity appears when certain bacteria reduce nitrates to nitrites, a process common among urinary pathogens like E. coli. When both findings are present, it strongly points to a bacterial urinary tract infection rather than other conditions. Neoplasms don’t typically cause nitrite positivity, diabetes mellitus isn’t defined by this nitrite/leukocyte pattern (it shows glucose or ketones rather than infection signs), and renal failure presents with kidney-specific dysfunction rather than this combination. So the pattern you’re seeing is most consistent with a bacterial infection of the urinary tract.