How is microscopic bacteriuria evaluated in the workup of Proteus infections?

Updated: Mar 03, 2020
  • Author: Shirin A Mazumder, MD, FIDSA; Chief Editor: Michael Stuart Bronze, MD  more...
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Microscopic bacteriuria is best evaluated through uncentrifuged Gram staining of the urine. Microscopic bacteriuria is found in 90% of cases when bacterial counts exceed 100,000 CFUs/mL. Detection by microscopy confirms infection, but absence does not exclude infection. Pyuria is demonstrated in nearly all acute bacterial infections, but its absence calls the diagnosis into question. The leukocyte esterase dipstick test is a useful alternative to microscopic examination, but this method is less sensitive than microscopy.

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