LabQMHub Editorial Team · ISO 15189:2022 Quality Management Series
A perfectly accurate test result that never reaches the right clinician, arrives too late, or is misunderstood on the page is, from the patient’s perspective, functionally useless. Post-examination processes — the steps between a result being generated and a clinician acting on it — are where analytical excellence either translates into genuine clinical value or quietly gets lost.
ISO 15189:2022’s Clause 7.4 addresses this critical final stretch of the total testing process: result verification, report content and clarity, critical value notification, and the timeliness that makes a result clinically actionable rather than merely accurate.
Result Verification Before Release
Before a result is released, it should be checked against plausibility criteria — delta checks comparing it to a patient’s own prior results, review against reference ranges, and correlation with other reported values from the same specimen — catching errors that passed quality control but still do not make clinical sense for this specific patient.
Autoverification systems, which release straightforward results meeting predefined criteria without manual review, must be carefully validated and limited to genuinely low-risk scenarios, with clear escalation rules ensuring any result outside those criteria is routed to manual review rather than released automatically by default.
Critical Value Notification: When Minutes Matter
Certain results — dangerously high potassium, critically low hemoglobin, a newly detected life-threatening infection — require immediate, direct communication to the responsible clinician, not simply posting to a result system and waiting for it to be noticed. ISO 15189:2022 expects laboratories to define critical value thresholds explicitly, and to have a reliable, documented notification process with defined timeframes.
Documentation of critical value notification should capture who was notified, when, and confirmation the message was received and understood — not merely that a call was attempted, since an unanswered call or an unclear voicemail does not meet the standard’s intent of ensuring the information genuinely reaches someone who can act on it.
Report Content and Clarity
A report must contain enough information for correct interpretation — units, reference ranges, any relevant interpretive comments, and clear flagging of results outside expected ranges — presented in a way a busy clinician can quickly and correctly understand, not buried in dense formatting or inconsistent terminology.
Amended or corrected reports require particular care: the amendment must be clearly distinguishable from the original report, and the laboratory must have a defined process for notifying anyone who already received and potentially acted upon the original, incorrect version.
Turnaround Time as a Quality Dimension
Timeliness is not a separate concern from accuracy — a technically accurate result delivered too late to inform a treatment decision has failed the patient just as surely as an inaccurate one. ISO 15189:2022 expects laboratories to define appropriate turnaround time targets for different test categories, particularly urgent and critical tests, and to monitor actual performance against those targets.
Turnaround time monitoring connects directly to the quality indicator principles covered later in this program — persistent delays in a specific test category are a genuine quality signal warranting investigation, not simply an operational inconvenience to be tolerated during busy periods.
Frequently Asked Questions
What counts as a critical value in laboratory testing?
A result so far outside the normal range that it represents an immediate, potentially life-threatening risk requiring urgent clinical action — thresholds are defined by each laboratory based on its patient population and clinical context.
Why does critical value notification require documented confirmation of receipt?
Because an unanswered call or an unclear message does not ensure the clinician actually knows about the dangerous result, defeating the purpose of urgent notification.
How should a laboratory handle a corrected report?
The amendment must be clearly distinguished from the original, and anyone who received the original incorrect result should be notified of the correction promptly.
Key Takeaways
- Post-examination processes determine whether an accurate result actually translates into timely, correct clinical action.
- Result verification before release should include plausibility checks against a patient’s own prior results, not rely on quality control alone.
- Critical values require direct, documented notification to a responsible clinician, with confirmation the message was received and understood.
- Report content must be clear enough for correct interpretation, with amendments clearly distinguished from original reports.
- Turnaround time is a genuine quality dimension, not merely an operational metric, since a late result can fail a patient as surely as an inaccurate one.
- Persistent turnaround time delays for specific test categories warrant investigation as a quality indicator, not routine tolerance.
Conclusion
The post-examination phase is where a laboratory’s technical work meets the clinical world it exists to serve. Getting the analytical result right is necessary but not sufficient — it must also reach the right person, in a clear form, in time to matter.
ISO 15189:2022’s post-examination requirements ensure this final, critical handoff receives the same systematic attention given to the analytical process itself.
Learn how laboratories manage nonconforming work when something goes wrong in the next course of this ISO 15189:2022 training series.
Source note: this article draws on “Quality Management in Clinical Laboratory Demystified” by Dr. Taleb Chalab Cham, ISO 15189:2022, and widely recognized clinical laboratory quality references including CLSI guidelines, CAP accreditation checklists, and WHO laboratory quality guidance.
