Overview
Culture media are formulated solid or liquid environments that recover, suppress, or phenotypically display bacteria according to laboratory purpose.
Classification
| Type | Function | Example use |
|---|---|---|
| Nutritive / enriched | Maximize recovery | Blood, chocolate agar |
| Selective | Suppress flora | Bile salts, antibiotic media |
| Differential | Show phenotypes | Lactose indicators, hemolysis |
| Enrichment broth | Amplify targets | Pre-subculture enrichment |
Morphologic Features
Colony color, size, and hemolysis are medium-dependent phenotypes. Interpret with the plate’s intended chemistry in mind.
Laboratory Characteristics
- Media QC with control organisms
- Lot/expiration tracking
- Specimen setup chart adherence
- Pure subculture before ID panels
Reference Intervals
Not numeric. Acceptable performance ranges for media QC organisms are defined in laboratory quality procedures, verify locally.
Clinical and Laboratory Significance
Correct media choice and plate reading determine whether pathogens are recovered and appropriately prioritized for identification and notification.
Differential Considerations
Distinguish target pathogens from flora using selective intent + phenotype + quantity. Distinguish true nonfermenters from mixed or overlapping colonies needing purity plating.
Comparison Tables
Plate-reading decision frame
| Question at plate reading | Purpose | Action |
|---|---|---|
| Was this plate meant to find X? | Selective intent | Focus on X-compatible colonies |
| What phenotype is shown? | Differential clue | Prioritize matching colonies |
| How many / how pure? | Significance | Work up vs document flora per SOP |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge brand colors and local media menus
- Never finalize ID from differential color alone
- No therapy language from plate phenotypes
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 Culture Media foundational topics Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Culture Media laboratory reference?
Culture Media is a Foundational Topics entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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