Overview
Valid, invalid, and inconclusive/indeterminate describe whether a molecular assay outcome meets conditions for a reportable clinical call. Invalid means required analytical conditions failed. Inconclusive/indeterminate is used only when the assay procedure defines that category.
Classification
| Category | Report implication |
|---|---|
| Valid | Release detected / not detected / numeric per SOP |
| Invalid | Do not report as negative; follow invalid procedure |
| Inconclusive / indeterminate | Use validated wording and SOP next steps |
Morphologic Features
Not applicable, this entry covers result categories, not morphologic identification.
Laboratory Characteristics
- Category choice is assay- and SOP-defined
- Blank targets with failed controls may be invalid
- Do not invent local wording that changes category meaning
Reference Intervals
Not applicable as a universal numeric interval. Validity and inconclusive criteria are defined by the validated assay procedure.
Clinical and Laboratory Significance
Correct category selection prevents false reassurance (invalid called negative) and unsupported certainty. Clinical decisions must wait for a valid reportable result or an explicitly defined inconclusive pathway.
Differential Considerations
Before calling negative, exclude invalid controls, inhibition/process flags, unacceptable specimens, and incomplete troubleshooting. Before calling inconclusive, confirm the assay actually defines that category.
Comparison Tables
Valid / invalid / inconclusive checkpoints
| Statement | Safe understanding | Unsafe shortcut |
|---|---|---|
| Failed IC + blank targets | Likely invalid, follow SOP | Report negative for discharge |
| Inconclusive | Assay-defined unresolved category | Guess soft positive/negative |
| Invalid | Analytical failure state | Same as not detected |
Classification Frameworks
Not applicable . WHO disease classifications do not define laboratory valid/invalid/inconclusive result categories.
Laboratory Notes
- Never report invalid as negative
- Inconclusive/indeterminate follows assay procedure language
- Hold until SOP next steps are complete
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 Valid, Invalid, and Inconclusive Results additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
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Valid, Invalid, and Inconclusive Results is a Additional Test References entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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