Overview
External quality assessment (EQA), also called proficiency testing (PT) in many settings, challenges the laboratory with unknown or coded samples from an outside program so results can be compared with peers or expected performance.
Classification
| Concept | Bench meaning |
|---|---|
| Challenge sample | External unknown coded for evaluation |
| Peer / expected compare | Your result vs program targets or peers |
| Acceptable | Performance meets program criteria |
| Unacceptable | Investigate cause and correct per SOP |
Morphologic Features
Not applicable, this entry covers external performance assessment, not morphology.
Laboratory Characteristics
- Worldwide practice; organizations such as WHO, ISO, CLSI, CAP, or IFCC may promote related principles
- Not a substitute for daily QC
- Local SOP defines participation, submission, and investigation steps
Reference Intervals
Not a patient reference interval. Acceptance criteria are defined by the EQA/PT program and laboratory follow-up policy.
Clinical and Laboratory Significance
Unacceptable EQA/PT performance can signal method, reagent, equipment, operator, or reporting problems that also affect patients.
Differential Considerations
Distinguish EQA/PT (external challenge) from daily QC (known controls), method verification, and formal validation projects.
Comparison Tables
EQA/PT checkpoints
| Pressure point | Safe response | Unsafe shortcut |
|---|---|---|
| Challenge kit arrives | Log, store, and test per instructions | Treat as optional practice; skip controls |
| Unacceptable score | Investigate, document, correct | File and ignore because 'QC is fine' |
| Busy week | Still handle EQA with patient-level care | Rush submission without identity/method checks |
Classification Frameworks
Not applicable as a disease classification. WHO and similar bodies may promote laboratory quality principles, they are examples of organizations, not a document curriculum here.
Laboratory Notes
- EQA/PT = external challenge + comparison
- Unacceptable → investigate
- Same discipline as patient testing
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 External Quality Assessment (Proficiency Testing) additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
What is the External Quality Assessment (Proficiency Testing) laboratory reference?
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