Examination of Gram Stains of Urine

  • Author: Rebecca Buxton1
    Affiliations: 1: Department of Pathology, University of Utah, Salt Lake City, Utah, 84132
  • Citation: Rebecca Buxton. 2007. Examination of gram stains of urine.
  • Publication Date : February 2007
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These images are from the original published atlas: Tenover, F. C., and J. V. Hirschmann. 1990. Interpretation of Gram stains and other common microbiologic slide preparations. The UpJohn Company, Kalamazoo, Mich. Permission granted to the ASM MicrobeLibrary by Pfizer Inc.

This atlas was written to help clinicians, microbiologists, and laboratory personnel identify organisms in infected materials stained by techniques commonly used in most clinical laboratories. Please refer to the atlas' main page for more information and a guide to all of the images.

Gram stains of urine specimens that have not been centrifuged can help determine the cause of a suspected urinary tract infection. If bacteria are present under an oil immersion lens (1,000x), the concentration is at least 104 or 105 bacteria per milliliter. Since the concentration of bacteria in most patients with symptomatic urinary tract infections is that high, the Gram stain will usually, but not always, be positive.

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