Overview
Critical value reporting is the practice of promptly communicating a result far enough outside expected limits to require immediate clinical action to an authorized receiver, confirming the value was correctly heard, and documenting the notification.
Classification
| Step | What it means |
|---|---|
| Verify | Confirm per SOP before calling, if required |
| Communicate | Reach an authorized receiver promptly |
| Read-back | Receiver repeats the value to confirm it was heard |
| Document | Record who, when, what value, and read-back |
| Escalate | Use alternate contact if usual receiver is unreachable |
Morphologic Features
Not applicable, this entry covers a communication and safety practice, not morphology.
Laboratory Characteristics
- Reporting is complete only when a person who can act has confirmed the value
- A busy line or unavailable contact means escalate, not delay
- Local SOP defines exact critical limits, phone lists, and repeat-testing rules
Reference Intervals
Critical limits are set by local policy for each analyte and are not universal numeric values. Always verify current institutional critical limits.
Clinical and Laboratory Significance
A true critical value may reflect a dangerous physiological state that can progress quickly without treatment, timely, confirmed notification directly supports patient safety.
Differential Considerations
Distinguish a true critical value from pre-analytical error (wrong tube, IV contamination, dilution), analytical error (interference, instrument malfunction), and identity or specimen mix-up.
Comparison Tables
Critical value reporting checkpoints
| Pressure point | Safe response | Unsafe shortcut |
|---|---|---|
| Usual line busy | Escalate to alternate contact or supervisor | Release to LIS and call back later |
| Unexpected critical value | Verify per SOP, then report promptly | Hold indefinitely awaiting certainty |
| Call connects | Give read-back and document | Give the value and hang up without confirmation |
Classification Frameworks
Not applicable . WHO disease classifications do not define critical value reporting practice. Organizations such as WHO, ISO, CLSI, CAP, or IFCC may promote similar timely-notification principles as examples only.
Laboratory Notes
- Verify → communicate → read-back → document
- Escalate if unreachable, never simply delay
- LIS release alone is not reporting
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 Critical Value Reporting additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
What is the Critical Value Reporting laboratory reference?
Critical Value Reporting is a Additional Test References entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
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Can reference details vary between laboratories?
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