A study published in the New England Journal of Medicine showed urine tests may not always be effective in detecting urinary tract infections. Researchers analyzed the urine samples of 226 women and found no evidence of bacteria in the midstream urine or in the bladder urine of almost 25% of women who showed signs of UTI. "Our findings are further confirmation that collection of urine has limited usefulness. You don't get the results back for two days, and just practically speaking, it's an added cost because we know E. coli causes most UTIs," lead author Thomas Hooton said.

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