Overview
A lot-to-lot check is a planned comparison of a new reagent or kit lot against the current lot or defined acceptance criteria before the new lot is released for routine molecular patient testing.
Classification
| Activity | Question answered |
|---|---|
| Lot-to-lot check | Is this new lot acceptable vs current/expected performance? |
| Daily QC | Are today's controls/run checks acceptable? |
| Calibration | Is measurement aligned to a standard? |
| Method verification | Does the method perform as expected in our lab? |
| Validation (intro) | What is performance of a new/modified method? |
Morphologic Features
Not applicable, this entry covers reagent lot acceptance, not morphologic identification.
Laboratory Characteristics
- Acceptance criteria defined before testing
- Lot numbers recorded for traceability
- Failed lots clearly quarantined/labeled
Reference Intervals
Not a patient reference interval. Acceptance limits for lot comparison are assay- and SOP-specific (often including weak-positive or near-cutoff materials).
Clinical and Laboratory Significance
Unchecked lot changes can shift sensitivity or background and alter borderline molecular calls without an obvious instrument failure message.
Differential Considerations
Sudden changes in positivity or control behavior after a supply change should prompt lot review in addition to contamination and instrument troubleshooting.
Comparison Tables
Lot-change checkpoints
| Statement | Safe understanding | Unsafe shortcut |
|---|---|---|
| Same kit name | Still perform lot acceptance per SOP | Skip check because packaging matches |
| One control passed on day 1 | Helpful but may not equal full lot protocol | Declare lot fully verified |
| Lot check failed | Quarantine and escalate | Use carefully on non-urgent patients |
Classification Frameworks
Not applicable . WHO disease classifications do not define molecular lot-to-lot checking.
Laboratory Notes
- Compare before go-live
- Keep current lot available until new lot is accepted
- Lot check ≠ daily QC ≠ method verification ≠ validation
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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