Overview
Quality control materials are samples with known target values used to check that a laboratory method is performing as expected. They are selected and handled according to the assay SOP, including level, lot, storage, and expiry.
Classification
| Check | What to confirm |
|---|---|
| Assay match | Product approved for this method/matrix |
| Level | Correct level(s) required by SOP |
| Lot | Correct lot; document changes |
| Storage / expiry | Stored as labeled; not expired |
Morphologic Features
Not applicable, this entry covers QC materials, not cell morphology.
Laboratory Characteristics
- Often run at 2–3 levels to cover more of the range
- Identity errors (wrong vial/level/lot) are common on busy benches
- Open-vial stability may differ from unopened storage, follow SOP
Reference Intervals
Not a patient reference interval. Each QC material has method-specific targets and acceptable limits defined by the laboratory SOP or manufacturer guidance adopted locally.
Clinical and Laboratory Significance
Incorrect QC materials undermine the daily method check and can allow unreliable patient results to be released, or create unnecessary holds.
Differential Considerations
Not a disease differential. When QC looks unexpected, first rule out wrong level, wrong lot, expired material, or assay mismatch before blaming the instrument.
Comparison Tables
QC material checkpoints
| Situation | Safe action | Unsafe shortcut |
|---|---|---|
| Two similar Level 2 bottles | Read assay name, lot, and expiry | Grab 'any Level 2' |
| Near-expiry vial | Replace if expired or per SOP open-vial rules | Use 'just for this morning' |
| New lot arrives | Document lot; follow SOP for targets/ranges | Mix old and new without noting the change |
Classification Frameworks
Not applicable . WHO disease classifications do not define QC materials.
Laboratory Notes
- Known target ≠ patient sample
- Match assay + level + lot + expiry
- Document what you used
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. (Laboratory quality and management chapters, verify current edition.)
CLSI and Professional Guidelines
- Institutional laboratory SOPs, locally adopted quality policies, and manufacturer instructions for use (IFU). Always verify current local practice.
Frequently Asked Questions
Common questions about using this Quality Control Materials additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
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