Overview
Bacterial identification workflow is the controlled sequence of morphologic, phenotypic, proteomic, and/or molecular evidences used to reach a verified, reportable organism identification.
Classification
| Method class | Strength | Limit |
|---|---|---|
| Direct smear | Early morphology | Not species ID |
| Colony phenotype | Group clues | Overlap across species |
| Spot biochemistry | Fast branch points | Single-test over-call risk |
| MALDI-TOF | Rapid species when accepted | Database/score/purity limits |
| Molecular | Targeted or broad ID support | Assay-specific claims |
Morphologic Features
Gram morphology and colonial features remain mandatory congruence checks for instrument IDs throughout the workflow.
Laboratory Characteristics
- Purity before species acceptance
- Local MALDI score rules
- Supplemental test triggers
- Preliminary vs final LIS states
Reference Intervals
MALDI score cutoffs, panel probability thresholds, and confirmation algorithms are laboratory-validated, verify current SOP and software versions; do not treat textbook examples as universal release criteria.
Clinical and Laboratory Significance
A verified ID enables appropriate reporting and selective AST handoff; unverified IDs risk misleading clinical pathways.
Differential Considerations
Separate database miss, mixed spot, wrong genus congruence failure, and true rare phenotype when methods disagree.
Comparison Tables
Verification cues
| Situation | Action | Avoid |
|---|---|---|
| High-score MALDI + congruent Gram | Release per SOP | Skipping purity check |
| Borderline score | Repeat / supplement per SOP | Blind Accept |
| MALDI ≠ morphology | Stop; re-spot / re-ID | Editing Gram to match instrument |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge institutional ID algorithms and MALDI menus
- Document preliminary names when species pending
- No therapy selection from ID workflow steps
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 Bacterial Identification Workflow foundational topics Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Bacterial Identification Workflow laboratory reference?
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