Overview
Molecular diagnostic target categories describe the broad classes of nucleic acid findings a clinical assay is validated to detect or quantify: infectious agents, inherited markers, acquired mutations, pharmacogenetic variants, and monitoring markers.
Classification
| Category | Origin of target | Typical purpose |
|---|---|---|
| Infectious agent | Pathogen genome | Confirm presence of an organism |
| Inherited marker | Patient's germline DNA | Identify a known heritable variant |
| Acquired mutation | Diseased tissue DNA/RNA | Support diagnosis or therapy selection |
| Pharmacogenetic marker | Patient's germline DNA | Predict drug metabolism/response |
| Monitoring marker | Pathogen or tumor-derived nucleic acid | Track quantity over time |
Morphologic Features
Not applicable, target categories are defined by origin and clinical purpose, not by visual morphology.
Laboratory Characteristics
- Specimen type and handling depend on the target category (e.g., blood for germline markers, respiratory swab for many pathogens)
- Result format differs by category, qualitative detected/not detected versus quantitative values
- Assay validation defines exactly which targets within a category are reportable
Reference Intervals
Not a single fixed range, qualitative categories report detected/not detected, while monitoring markers (e.g., viral load) use assay-specific quantitative reportable ranges defined by validation.
Clinical and Laboratory Significance
Identifying which target category an ordered assay belongs to is the first step in correctly interpreting any molecular result and avoiding conflation between infection, inherited risk, and acquired disease findings.
Differential Considerations
Not applicable in the traditional sense, this entry differentiates target categories rather than disease differentials for a single condition.
Comparison Tables
Target category interpretation pitfalls
| Category | Result meaning | Common pitfall |
|---|---|---|
| Infectious agent | Organism nucleic acid present | Equating detection with active severe disease |
| Inherited marker | Variant present in patient's genome | Assuming it indicates current illness |
| Acquired mutation | Variant present in tested tissue only | Generalizing to the whole body |
| Monitoring marker | Quantity at time of testing | Over-interpreting a single value without trend |
Classification Frameworks
Not applicable . World Health Organization (WHO) disease classification systems are specific to diagnosed conditions, not to this general target-category overview.
Laboratory Notes
- Always confirm which target category an ordered test belongs to before collecting a specimen or reporting a result
- Institutional test menus specify the exact validated targets within each category, do not assume broader coverage
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.
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