Overview
Common molecular specimen types are the matrices most frequently submitted for clinical nucleic acid testing. This entry lists typical clinical associations for orientation only, collection devices, transport media, storage, and acceptance criteria depend on the validated assay and the manufacturer or laboratory procedure.
Classification
| Category | Examples |
|---|---|
| Respiratory | Nasopharyngeal swabs (device/media per assay) |
| Blood matrices | Whole blood, plasma, serum |
| Other fluids | Urine, stool, cerebrospinal fluid (CSF) |
| Tissue | Fresh/frozen tissue per SOP; FFPE tissue |
Morphologic Features
Not applicable, this is a specimen-matrix reference, not a morphologic atlas.
Laboratory Characteristics
- Menus differ by platform and institution
- Same disease name may map to different validated specimen types across assays
- Processed tissues (FFPE) have additional assay-defined handling limits
Reference Intervals
Not applicable at the specimen-type level, each molecular assay defines its own reportable results and cutoffs after validation on accepted matrices.
Clinical and Laboratory Significance
Choosing an appropriate, assay-validated specimen type is required for clinically usable molecular results. Wrong or poor specimens can produce false-negative, invalid, or unreliable findings.
Differential Considerations
When a molecular result conflicts with strong clinical suspicion, review whether the submitted specimen type and collection system matched the assay validation, not only whether amplification chemistry performed.
Comparison Tables
Molecular specimen selection (assay-specific, verify locally)
| Specimen type | Typical clinical uses (examples) | Assay-specific note |
|---|---|---|
| Nasopharyngeal swabs | Respiratory pathogen molecular detection | Swab type and transport medium must match the assay SOP, not universal |
| Whole blood | Selected infectious, genetic, or cellular nucleic acid tests | Anticoagulant and volume requirements vary by assay |
| Plasma | Many viral load and selected cell-free nucleic acid assays | Not interchangeable with serum unless the assay validates both |
| Serum | Selected assays that explicitly list serum | Accept only when the menu/IFU lists serum |
| Urine | Selected STI or pathogen molecular assays | Collection timing and preservative rules are assay-specific |
| Stool | Gastrointestinal pathogen molecular panels | Transport device and fill guidance follow the assay SOP |
| Cerebrospinal fluid (CSF) | CNS infection molecular testing | Limited volume, verify assay and priority before use |
| Tissue | Pathogen detection or selected markers in tissue | Container and handling depend on the validated procedure |
| Formalin-fixed paraffin-embedded (FFPE) tissue | Oncology/pathology molecular markers on archived tissue | Fixation and block requirements are assay- and laboratory-specific |
Classification Frameworks
Not applicable, specimen matrices are defined by laboratory validation and assay intended use, not by WHO disease classification tables.
Laboratory Notes
- Use this table for orientation; open the assay SOP for acceptance decisions
- Collection devices, transport media, storage, and acceptance criteria depend on the validated assay and manufacturer/laboratory procedure
- Poor specimens → false-negative, invalid, or unreliable results
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
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021. (Molecular diagnostics chapters, verify current edition.)
- Buckingham L. Molecular Diagnostics: Fundamentals, Methods, and Clinical Applications. 3rd ed. F.A. Davis; 2019. (Verify current edition.)
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute (CLSI). Consult current CLSI molecular method documents available through your laboratory, document numbers and editions change; do not treat any single CLSI title as universal.
- Institutional molecular laboratory SOPs, assay manufacturer instructions for use (IFU), and locally adopted accreditation requirements. Always verify current local practice.
Frequently Asked Questions
Common questions about using this Common Molecular Specimen Types additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Common Molecular Specimen Types laboratory reference?
Common Molecular Specimen Types is a Additional Test References entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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