The presence of nitrates in urine is often considered a predictor of a urinary tract infection (UTI). Urinary tract infections are the most common cause of nitrites in urine. These occur when bacteria infect the bladder, ureters, or kidneys. Nitrites are byproducts of nitrogen waste. Bacteria responsible for an infection feed on this waste, breaking it down into nitrates, which can appear in the urine.
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