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Related Experiment Videos

Primary culture media for routine urine processing

J C Fung, B Lucia, E Clark

    Journal of Clinical Microbiology
    |October 1, 1982
    PubMed
    Summary
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    Routine urine culture should include colistin-nalidixic acid agar and MacConkey agar. This combination improves detection of significant bacterial growth, particularly gram-positive organisms, compared to using blood agar.

    Area of Science:

    • Clinical Microbiology
    • Diagnostic Laboratory Science
    • Urine Specimen Analysis

    Background:

    • Standard urine culture protocols often recommend blood agar and MacConkey agar.
    • Limited data exist to support the routine use of blood agar in conjunction with MacConkey agar for urine specimen processing.

    Purpose of the Study:

    • To evaluate the effectiveness of different agar media combinations for quantitative urine culture.
    • To determine if blood agar is essential when using MacConkey agar for urine microbiology.

    Main Methods:

    • Quantitative plating of 2,553 midstream, clean-voided urine samples.
    • Comparison of growth on blood agar, MacConkey agar, and colistin-nalidixic acid agar.
    • Assessment of bacterial growth detection across the three media types.

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    Main Results:

    • The combination of colistin-nalidixic acid agar and MacConkey agar proved to be the optimal choice.
    • Utilizing colistin-nalidixic acid agar instead of blood agar enhanced the detection of significant growth.
    • Specific organisms like enterococci, lactobacilli, and Torulopsis glabrata were more readily identified.

    Conclusions:

    • Colistin-nalidixic acid agar and MacConkey agar provide a superior medium combination for routine urine culture.
    • Replacing blood agar with colistin-nalidixic acid agar improves the diagnostic yield for key urinary pathogens.
    • This revised approach enhances the identification of clinically significant microorganisms in urine samples.