Overview
Stool culture is a specimen-to-report pathway that uses selective media and limited workup to detect ordered enteric bacterial pathogens within dense fecal microbiota.
Classification
| Pathway element | Bench cue | Avoid |
|---|---|---|
| Accession | Transport, timing, order match | Ignoring local rejection windows |
| Setup | Enteric selective media menu | Blood agar–only “full ID” mindset |
| Workup | Screen-positive colonies only | ID every LF colony as pathogen |
| Report | Confirmed enteric targets ± method notes | Drug/dose recommendations |
Morphologic Features
Colony morphology on selective enteric media (e.g., non-lactose, H2S, Campylobacter colony types) is a screening cue, confirmation follows local biochemical, antigen, MALDI, or molecular steps before final pathogen claims.
Laboratory Characteristics
- Enteric transport preferred when required by SOP
- Campylobacter atmosphere/temperature per chart
- STEC/toxin pathway as locally defined
- Reportable-disease notification per policy
Reference Intervals
Organism menus, hospitalization acceptance cutoffs, enrichment rules, and public-health notification lists are institutional, verify SOP; do not treat any single textbook list as universal.
Clinical and Laboratory Significance
Confirmed enteric pathogens on the local menu are high-significance laboratory findings. Expected fecal flora without pathogenic markers is not reported as infection.
Differential Considerations
Differentiate bacterial culture screens from O&P, C. difficile algorithms, and multiplex PCR panels; differentiate STEC pathways from generic E. coli recovery; differentiate nonviable PCR targets from culture-confirmed organisms.
Comparison Tables
Stool report cues
| Result pattern | Framing | Do not claim |
|---|---|---|
| Salmonella confirmed | Enteric pathogen recovered | Empiric drug regimen |
| Heavy LF flora only | No enteric pathogen detected (screen) | “E. coli colitis” from LF growth |
| PCR+ / culture− | Method discordance, follow SOP wording | Silent overwrite of either method |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge enteric menus and rejection windows as local
- No treatment or dosing language
- Selective screen ≠ polymicrobial wound workup
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- Forbes BA, Sahm DF, Weissfeld AS. Bailey & Scott's Diagnostic Microbiology. 15th ed. Elsevier; 2020.
- Mahon CR, Lehman DC, Manuselis G. Textbook of Diagnostic Microbiology. 6th ed. Elsevier; 2018.
- Carroll KC, Hobden JA, Miller S, et al. Jawetz, Melnick, & Adelberg's Medical Microbiology. 28th ed. McGraw-Hill; 2019.
- Murray PR, Rosenthal KS, Pfaller MA. Medical Microbiology. 9th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Performance Standards for Antimicrobial Susceptibility Testing. CLSI document M100 (verify current edition and institutional adoption).
- Centers for Disease Control and Prevention / NIH. Biosafety in Microbiological and Biomedical Laboratories (BMBL). Current edition (verify institutional adoption).
Frequently Asked Questions
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What is the Stool Culture laboratory reference?
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