Overview
CSF culture is the sterile-site microbiology pathway that combines urgent direct examination with culture and identification to support meningitis and device-related CNS infection workups.
Classification
| Workflow element | Bench cue | Common failure |
|---|---|---|
| Accession | ID, tubes, volume, orders | Ignoring shared-section needs |
| Direct exam | STAT Gram stain | Waiting for colonies |
| Culture | Local sterile-fluid media | Volume waste on plates |
| Report | Prelim/final ± critical call | Drug/dose recommendations |
Morphologic Features
Gram stain of CSF may show organisms with or without neutrophils. Morphology guides preliminary reporting; culture confirmation and identification follow incubation and local ID methods.
Laboratory Characteristics
- STAT smear queue priority
- Sterile-fluid media menu (local)
- Critical-call documentation
- Aliquot coordination with other sections
Reference Intervals
Critical-notification triggers, media menus, incubation hold times, and preferred culture tubes are institutional, verify SOP; do not treat textbook examples as universal policy.
Clinical and Laboratory Significance
Organisms from valid CSF collections are high-significance findings. Contaminant claims require documented criteria. Negative culture does not exclude all CNS infections (viruses, prior antimicrobials, fastidious organisms).
Differential Considerations
Differentiate true CNS pathogens from skin-flora contamination (traumatic tap, shunt colonization debates), and differentiate bacterial culture pathways from viral PCR and cryptococcal antigen stacks ordered separately.
Comparison Tables
CSF report cues
| Result pattern | Framing | Avoid |
|---|---|---|
| Organisms on Gram stain | Critical prelim per local list | Therapy advice |
| Culture growth, sterile site | Significant pending workup | Casual contaminant label |
| No growth after hold | No bacteria recovered (method limits) | Claiming all meningitis excluded |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge media menus and critical lists as local
- No treatment or dosing language
- Never exhaust shared CSF volume for one test
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
Common questions about using this CSF foundational topics Medical Laboratory Library reference in Medical Laboratory Science education.
What is the CSF laboratory reference?
CSF is a Foundational Topics entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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Can reference details vary between laboratories?
Yes. Methods, intervals, and reporting conventions vary. Always confirm details against your laboratory’s current protocols.
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