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Journal of Clinical Microbiology, January 2004, p. 60-64, Vol. 42, No. 1
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.1.60-64.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Practical Bench Comparison of BBL CHROMagar Orientation and Standard Two-Plate Media for Urine Cultures

Holly A. D'Souza,1 Mary Campbell,2 and Ellen Jo Baron1*

Department of Pathology,1 Department of Medicine, Stanford University Medical School, Stanford, California 943052

Received 30 July 2003/ Returned for modification 10 September 2003/ Accepted 7 October 2003

A total of 1,023 urine samples sent for routine culture were plated onto sheep blood and MacConkey agars and a BBL CHROMagar Orientation (CO; Becton Dickinson, Cockeysville, Md.) plate, and the results were compared. Of these, 250 urine samples (24%) grew >10,000 CFU of one or two putative pathogens/ml and 773 showed no growth (NG), mixed growth of <10,000 CFU/ml, or three or more strains (mixed). The CO and conventional medium results agreed completely for 595 cultures with NG or <10,000 CFU/ml. An additional 178 urine samples yielded clinically insignificant differences. Both medium sets essentially agreed on quantities and identification for 400 single-pathogen cultures and 9 mixed cultures. With the caveat that CO cannot differentiate Klebsiella, Enterobacter, and Serratia spp., enteric pathogens were identified only by morphology and color on CO. Direct visual differentiation of group B streptococci from lactobacilli is not possible, but lactobacillus cells always exhibited easily recognizable morphology on Gram stain. Of 108 paired organism susceptibility results encompassing 2,268 drug-pathogen combinations, there were 3% errors and only 1% very major errors. Use of CO allowed a >50% reduction in inoculation time and a >20% reduction in work-up time. For our laboratory, with 50% "no growth" and ca. 25% significant results (50% Escherichia coli), CO allowed time and workup cost savings for a majority of cultures. A cost analysis (time and supplies for our laboratory) showed that if CO is used alone, the break-even level for CO pricing is $1.78; if CO and blood agar are both used, the break-even pricing for CO is $1.53.

* Corresponding author. Mailing address: Clinical Microbiology/Virology Laboratory, Stanford University Medical Center, H1537-J, MC 5629, 300 Pasteur Dr., Stanford, CA 94305-5250. Phone: (650) 725-3773. Fax: (650) 725-5671. E-mail: ejbaron{at}stanford.edu.

Journal of Clinical Microbiology, January 2004, p. 60-64, Vol. 42, No. 1
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.1.60-64.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Baron, E. J., D'Souza, H., Qi Wang, A., Gibbs, D. L. (2008). Evaluation of the Biomic V3 Microbiology System for Identification of Selected Species on BBL CHROMagar Orientation Agar and CHROMagar MRSA Medium. J. Clin. Microbiol. 46: 3488-3490 [Abstract] [Full Text]  


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