Overview
Mycology clinical interpretation integrates specimen site, organism quantity and purity, host risk, preanalytical quality, and diagnostic method stage into appropriately worded laboratory claims, without antifungal selection or dosing.
Classification
| Frame | Typical cues | Report emphasis |
|---|---|---|
| Contaminant | Environmental mold; plate artifact; poor specimen | Restrained / quality comment (SOP) |
| Colonizer | Mucosal/urine yeast; low-risk respiratory mold | Site-aware significance hedging |
| Pathogen-likely | Sterile site; tissue invasion; high-risk concordance | Full ID + critical pathway (local) |
Morphologic Features
Morphology supports group placement but does not by itself assign contaminant vs pathogen roles, anatomic and host context complete the interpretation.
Laboratory Characteristics
- Separate detection from attribution in comments
- Apply urine count and respiratory quality rules (local)
- Escalate invasive-mold and CSF antigen findings per SOP
- Keep prelim vs confirmed stages explicit
Reference Intervals
Colony-count thresholds, antigen cutoffs, critical-notification lists, and mold workup algorithms are institutional, verify current SOP rather than treating textbook examples as universal.
Clinical and Laboratory Significance
Claim strength rises with sterile-site recovery, tissue concordance, high-risk host, and multi-method agreement. Single nonsterile recoveries of common colonizers or environmental molds often warrant restrained wording.
Differential Considerations
Differentiate colonization from invasion, plate contamination from patient isolates, false-reactive antigens from true cryptococcal evidence, and dermatophyte KOH findings from unrelated systemic workups.
Comparison Tables
Interpretation cues
| Result | Lean frame | Do not claim |
|---|---|---|
| Low-quality urine Candida | Colonizer/contaminant-leaning | Invasive candidiasis slogan |
| CSF CrAg reactive | Strong Crypto adjunct stage | Drug/dose regimen |
| One sputum Aspergillus, neutropenia | Pathogen-possible; needs correlation | Automatic proven IPA from one colony |
Classification Frameworks
Not applicable.
Laboratory Notes
- Hedge thresholds, cutoffs, and critical lists as local
- Do not force one narrative onto discordant sites
- Never include antifungal treatment or dosing
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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