Overview
Pharmacogenomic (PGx) testing detects selected inherited variants and reports genotypes (and any laboratory-defined categories) for clinician use under institutional guidance. Laboratory training does not teach prescribing.
Classification
| Application element | Laboratory focus |
|---|---|
| Clinical question | Assay-defined PGx genotype/result? |
| Specimen | Blood / buccal / saliva (validated) |
| Target | Selected alleles only (menus vary) |
| Method | Targeted genotyping / institutional PGx panel |
| Controls | Support valid allele calls |
| Results | Alleles/diplotypes; optional phenotype labels; invalid |
| Limitations | Limited allele coverage; no-calls; labels ≠ doses |
| Correlation | Ordering provider + institutional PGx guidance |
Morphologic Features
Not applicable . PGx testing is a molecular genotype application, not morphologic identification.
Laboratory Characteristics
- Constitutional DNA specimen pathways
- Report only validated alleles
- Redirect medication questions to the care team
Reference Intervals
Not a numeric chemistry reference interval. Allele calls and any phenotype labels follow the validated PGx assay and reporting procedure.
Clinical and Laboratory Significance
PGx genotypes are laboratory findings. Clinical medication decisions require authorized clinical interpretation frameworks and are outside this overview.
Differential Considerations
Before over-interpreting results, consider wrong specimen, limited allele coverage, no-calls, and requests for dosing advice that must be declined and redirected.
Comparison Tables
PGx checkpoints
| Statement | Safe understanding | Unsafe shortcut |
|---|---|---|
| PGx genotype | Assay-defined laboratory result | Automatic dose written by MLS |
| Teaching gene example | Representative only | Complete drug–gene encyclopedia |
| Phenotype label (if reported) | Lab reporting category per SOP | Prescription instruction |
Classification Frameworks
Not applicable as a WHO disease-classification entry, this is a laboratory test overview.
Laboratory Notes
- Frame: question → specimen → target → method → controls → results → limits → correlation
- Do not teach prescribing or dosing
- Allele menus are institutional
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
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