Which of the following results on a urine dipstick is most specific for a urinary tract infection caused by Gram-negative bacteria?
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Correct answer: Positive Nitrite
The nitrite test depends on the conversion of dietary nitrate to nitrite by bacterial enzymes, primarily found in Gram-negative Enterobacteriaceae like E. coli. While a positive leukocyte esterase indicates inflammation, the nitrite test is more specific for bacteriuria.
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