alert limit value expression
IRI: https://spec.industrialontologies.org/ontology/construct/AlertLimitValueExpression
Defined In: https://spec.industrialontologies.org/ontology/biopharma/TargetsLimitsRanges/
SubClass Of: limit value expression
Class Hierarchy
owl:Thing › bfo:entity › bfo:continuant › bfo:generically dependent continuant › information content entity › value expression › limit value expression › alert limit value expression
Definition
limit value expression beyond which an early warning of potential drift from normal operating conditions is triggered, prompting closer monitoring or investigation
Explanatory Notes
1) An alert limit serves as an early warning indicator of process drift. It is typically established from process data using statistical methods such as control charts or capability analysis and is periodically reassessed during continued process verification (CPV). 2) The alert limit does not represent a specification or regulatory boundary. Instead, it supports proactive control by identifying trends or variations that may lead toward an action limit or out-of-specification condition if the underlying condition persists or worsens. 3) Where corresponding alert and action limits are established, the alert limit ordinarily lies closer to the expected operating region than the action limit. 4) FDA Sterile Drug Products Produced by Aseptic Processing — Current Good Manufacturing Practice: Guidance for Industry states “Environmental monitoring data will provide information on the quality of the manufacturing environment. Each individual sample result should be evaluated for its significance by comparison to the alert or action levels. Averaging of results can mask unacceptable localized conditions. A result at the alert level urges attention to the approaching action conditions. A result at the action level should prompt a more thorough investigation.”
Examples
- Chromatography column pressure has a normal operating range with an upper boundary of 1.5 bar, an alert limit of 1.8 bar, and an action limit of 2.0 bar. A pressure value beyond 1.8 bar provides an early warning of potential fouling or blockage before the action limit is reached
Synonyms
- alert limit
Adapted From
- https://www.biophorum.com/download/cvp-case-study-interactive-version/ and https://www.gmp-publishing.com/content/en/gmp-questionoftheday/what-is-an-alert-limit#:~:text=Alert%20limit:%20A%20pre%2Ddetermined,to%20a%20predefined%20action%20plan. and https://www.thermofisher.com/rs/en/home/industrial/microbiology/pharmaceutical-microbiology/environmental-monitoring/applications.html and https://health.ec.europa.eu/system/files/2022-08/20220825_gmp-an1_en_0.pdf
Primitive Class
This class is declared primitive and it does not have necessary and sufficient condiftions defined.
Primitive Rationale
There are insufficient constructs to create necessary and sufficient conditions.
Formal Axioms
First-Order Logic Axioms
AlertLimitValueExpression(x) → LimitValueExpression(x)
Semi-Formal Natural Language Axioms
If x is an ‘alert limit value expression’ then x is a ‘limit value expression’