Overview
Clinical microbiology cases integrate specimen collection, culture pathways, quality assessment, interpretation, and reporting into prioritized bench decisions without antimicrobial treatment content.
Classification
| Case pattern | Next move | Avoid |
|---|---|---|
| Identity failure | Reject/recollect | Planting unlabeled specimens |
| Positive BC / CSF smear | STAT exam + local notify | Drug orders in comments |
| Inadequate sputum | Quality comment / limited workup | Full oral-flora cascade |
| Mixed wound swab flora | Apply local limited ID | Sterile-site workup depth |
Morphologic Features
Case morphologic products (blood/CSF Gram stains, sputum quality grades) are early pathway outputs that drive notification and workup limits before final colony identification.
Laboratory Characteristics
- Queue triage by criticality
- Rejection codes and recollection requests
- Staged prelim/final reporting
- Institutional hedges on cutoffs and critical lists
Reference Intervals
Colony-count cutoffs, sputum grades, contamination definitions, media menus, and critical-notification lists used in cases are institutional, verify SOP.
Clinical and Laboratory Significance
Capstone reasoning assigns significance only after quality and site rules are applied. Concurrent specimens from one patient are correlated carefully but reported by site and method.
Differential Considerations
Differentiate rejection events from analytic positives; sterile-site urgency from mucosal colonization; preliminary smear claims from final ID; evidence framing from therapy selection.
Comparison Tables
Capstone triage cues
| Competing tasks | Higher priority | Lower priority |
|---|---|---|
| Unlabeled urine vs BC flag | BC STAT Gram pathway | Any urine plating |
| Saliva sputum vs CSF smear | CSF prelim/notify | Oral-flora ID |
| Routine stool screen vs leaking unlabeled cup | Resolve identity/biosafety | Enteric setup |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge all numeric cutoffs and critical lists as local
- No treatment or dosing language in case resolutions
- Always map decisions to collect → report 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
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