Overview
The molecular laboratory workflow is the standardized, ordered sequence of steps, order, specimen receipt, extraction, amplification, detection, controls, and report, that carries a specimen to a released, reportable molecular result.
Classification
| Phase | Includes | Purpose |
|---|---|---|
| Pre-analytical | Order, specimen receipt | Confirm the right test and an acceptable specimen |
| Analytical | Extraction, amplification, detection | Produce a technically valid signal |
| Post-analytical | Control review, report | Confirm validity and communicate the result |
Morphologic Features
Not applicable, this entry describes a laboratory process workflow rather than a cell, organism, or specimen morphology.
Laboratory Characteristics
- Fixed step order, never reordered or shortcut to save time
- Each step has defined acceptance criteria before the specimen can advance
- Unidirectional physical/procedural flow reduces amplicon contamination risk
Reference Intervals
Not applicable, workflow steps do not have reference ranges. Individual assays define their own acceptance criteria, cutoffs, and reportable ranges through validation.
Clinical and Laboratory Significance
Following workflow order in the correct sequence is what allows a molecular result to be trusted as a valid clinical answer rather than an artifact of a skipped or reversed step.
Differential Considerations
Not applicable, this entry describes a laboratory process rather than a differential diagnosis of a clinical condition.
Comparison Tables
Consequences of workflow order violations
| Step skipped or reversed | Likely consequence |
|---|---|
| Detection attempted before extraction is confirmed | Result may be falsely negative or invalid |
| Report released before control review | Unverified or invalid result reaches the chart |
| Pre-/post-amplification flow reversed | Increased amplicon contamination risk |
Classification Frameworks
Not applicable . World Health Organization (WHO) classification systems apply to specific disease entities, not laboratory workflow structure.
Laboratory Notes
- New staff should learn the fixed step order before learning assay-specific details
- Workflow deviations are a common root cause investigated during error and contamination reviews
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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