Overview
Blood bank quality control (QC) is the set of checks, on reagents, reagent red cells, antihuman globulin, and testing methods/instruments, performed at defined intervals to verify that a specific day's or lot's testing materials are behaving as expected before patient results are released.
Classification
| QC category | Example | What confirms it passed |
|---|---|---|
| Reagent antisera | Anti-A, anti-B, anti-D | Positive control reacts strongly; negative control does not react |
| Reagent red cells | Screening cells, antibody panel cells | Reactivity matches manufacturer-defined antigen profile |
| AHG / check cells | IgG-sensitized check cells | Agglutination confirms AHG reagent was active on a negative-phase tube |
| Method / instrument | Centrifuge, cell washer, gel/solid-phase system | Meets validated acceptance criteria (spin time, RPM, wash adequacy) |
Morphologic Features
Not a cell-morphology topic, this is a reagent/method quality-control reference.
Laboratory Characteristics
- Positive and negative controls are run together, both must behave as expected
- Check cells are added to every negative AHG-phase tube, not selected tubes only
- QC is performed before or concurrently with the patient testing it protects, not after the fact
- A meaningful change in expected reaction strength is treated as a QC concern, not ignored
Reference Intervals
No numeric reference range . QC is pass/fail against expected reaction pattern (reaction grade) for each reagent/control pair. Exact QC frequency and acceptance criteria are method- and SOP-specific; verify locally.
Clinical and Laboratory Significance
QC is the layer of the quality system closest to individual patient results, a passed QC set is what allows a specific run of patient testing to be trusted; a failed QC set invalidates every result generated with the affected reagent or method until resolved.
Differential Considerations
Distinguish a QC (reagent/method-level, per-run) failure from a QA (system-level, policy/process) gap and from an equipment-validation failure (instrument not qualified for use) . QC is the most immediate and frequent of the three checks.
For identity, LIS, and final-issue release checkpoints during compatibility testing (as opposed to reagent/method QC here), see also Compatibility Quality Checks (Module 5).
Comparison Tables
QC outcomes and required response
| Finding | Interpretation | Required action |
|---|---|---|
| Positive control reacts as expected; negative control does not react | QC passed | Proceed with patient testing |
| Positive control weak/absent or negative control reacts | QC failed | Hold testing; investigate; correct and re-verify |
| Negative AHG tube, check cells agglutinate | Valid negative result | Report result |
| Negative AHG tube, check cells fail to agglutinate | Invalid tube | Repeat testing, do not report |
Classification Frameworks
Not applicable, laboratory quality-control reference, not a WHO disease classification.
Laboratory Notes
- Never report a result generated with a reagent that failed QC, even under time pressure
- Investigate and correct the cause of a QC failure, do not simply repeat and hope for a passing result
- Retrospectively review already-reported results if a reagent is later found to have failed QC
- Related Module 5 topic: compatibility-quality-checks (identity and issue-release checkpoints)
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
- Cohn CS, Delaney M, Johnson ST, Katz LM, eds. Technical Manual. 21st ed. AABB; 2023.
- Harmening DM. Modern Blood Banking & Transfusion Practices. 7th ed. F.A. Davis; 2019.
CLSI and Professional Guidelines
- AABB. Standards for Blood Banks and Transfusion Services (verify current edition and institutional adoption).
- U.S. Food and Drug Administration. Code of Federal Regulations Title 21 . Blood and Blood Components (verify current institutional adoption).
- Clinical and Laboratory Standards Institute. Related immunohematology and specimen identity standards (verify current documents and institutional adoption).
Frequently Asked Questions
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