Overview
Trematodes are parasitic flukes. Clinical laboratory diagnosis primarily identifies characteristic eggs in stool or urine sediments using size, operculum, spine, and internal morphology criteria.
Classification
| Cue | Key feature | Specimen |
|---|---|---|
| S. mansoni | Lateral spine | Stool |
| S. japonicum | Small/inconspicuous spine | Stool |
| S. haematobium | Terminal spine | Urine |
| Fasciolid-type | Very large operculated | Stool |
| Clonorchis/Opisthorchis-type | Small operculated | Stool |
Morphologic Features
Record length/width, operculum presence and shoulders, spine location, shell thickness, and embryonation. Schistosome eggs are non-operculate in the classical teaching sense and are spine-oriented.
Laboratory Characteristics
- Low-power scan for large eggs
- Urine sedimentation/centrifugation per local SOP for S. haematobium
- Multiple specimens may be needed due to intermittent shedding
- Micrometry required for large operculated differentials
Reference Intervals
Detected/not detected qualitative reporting is standard. Quantitative egg counts and critical notification lists are institutional, verify local protocols.
Clinical and Laboratory Significance
Morphologically confirmed trematode eggs support fluke infection diagnosis when specimen source matches the organism frame.
Differential Considerations
Differentiate fluke eggs from operculated cestode eggs and plant material. Separate schistosome species frames using spine position and size.
Comparison Tables
Schistosome vs operculated fluke framing
| Feature | Schistosome eggs | Operculated fluke eggs |
|---|---|---|
| Classic cue | Spine location | Operculum |
| S. haematobium site | Urine | Usually stool |
| Embryo | Often mature miracidium cues | Often undeveloped when fresh |
| Common miss | Wrong specimen | Size overlap among large eggs |
Classification Frameworks
Not applicable, laboratory morphologic frame, not a WHO disease list.
Laboratory Notes
- Correct specimen before calling a negative trematode exam
- Hedge concentration and urine-collection timing as local
- No therapy language in reports
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).
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