Forty of 42 patients had positive Foley catheter tip cultures, but only 14 had significant numbers of bacteria in a urine specimen obtained the same day. In these 14 patients, a 98% probability existed that at least one organism from the catheter tip culture would not grow in a simultaneous urine culture. The predictive value of the tip cultures was nonexistent; presence of most organisms in the tip probably represented contamination from the urethra.
(JAMA 228:72-73, 1974)
Gross PA, Harkavy LM, Barden GE, Kerstein M. Positive Foley Catheter Tip Cultures—Fact or Fancy? JAMA. 1974;228(1):72–73. doi:10.1001/jama.1974.03230260046024
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