Overview
Molds are filamentous fungi that grow as hyphae and frequently produce asexual spores or conidia. Clinical laboratories describe colony and microscopic morphology as evidence toward identification and interpret recovery with site-aware caution.
Classification
| Morphologic frame | Typical cue | Lab note |
|---|---|---|
| Septate hyaline molds | Septate hyphae; pigment variable | Includes many Aspergillus-like forms |
| Dematiaceous molds | Darkly pigmented hyphae/conidia | Record pigmentation carefully |
| Sparsely septate (Mucorales-like) | Broad, ribbon-like hyphae | Urgent clinical correlation when significant |
| Dermatophyte-like | Skin/hair/nail association | Special media may be used locally |
Morphologic Features
Record hyphal width and septation, branching pattern, and reproductive structures (conidiophores, vesicles, phialides, spore arrangements). LPCB mounts support visualization when permitted by biosafety SOP.
Laboratory Characteristics
- Often incubated near room temperature on fungal media
- May require days for mature sporulation
- Dual-temperature workups when dimorphism suspected
- Referral or molecular methods when morphology unsafe/insufficient
Reference Intervals
No numeric reference interval. Interpret recovered molds with quantity, repeatability, and site comments. Hold times and media selections are laboratory-specific.
Clinical and Laboratory Significance
Sterile-site molds and tissue-invasive evidence carry high weight. Single colonies from sputum or skin often need cautious wording pending correlation.
Differential Considerations
Differentiate true mold growth from bacterial swarming, plate contaminants introduced after inoculation, and nonfungal fibers on direct mounts.
Comparison Tables
Mold significance cues
| Cue | Favors pathogen signal | Favors contaminant/colonizer |
|---|---|---|
| Site | Sterile / tissue | Nonsterile surface flora sites |
| Quantity | Heavy / repeated | Single sparse colony |
| Host | High-risk immunocompromise | Low-risk, no supporting findings |
| Histo correlation | Invasion seen | No tissue evidence |
Classification Frameworks
Not applicable, laboratory morphologic frame.
Laboratory Notes
- Never force open mounts against biosafety SOP
- Hedge media menus and morphologic ID charts as local
- No treatment language from colony morphology
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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