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Diagrammatic representation in stated view of concept 419375001 |Allergic reaction caused by oil (disorder)|as in the International Edition version 20220831.

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SNOMED CT

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concept model

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For all of the above, examples should be included. 

Please note that the title of this section may be updated to be more descriptive in relation to the scope of this project (e.g. "Allergy Content in SNOMED CT", or "Epilepsy Content in SNOMED CT" .

Notes on target audience for this chapter:

• This section is relevant for the clinical audience who seeks to understand how SNOMED CT, from a pure content perspective, supports the described use cases.
• Information managers involved with the development of subsets or queries to be used within an implementation are also key stakeholders for this section. 

SNOMED CT concept model

The SNOMED CT concept model for allergy-related conditions has undergone significant changes (see Appendix B: Historical SNOMED CT content perspective for the history of changes). Currently, SNOMED allergy content is organized under the umbrella of hypersensitivity, which is defined by the World Allergy Organization (WAO) as “objectively reproducible symptoms or signs initiated by exposure to a defined stimulus at a dose tolerated by normal persons”. 

Hypersensitivity encompasses both allergy and non-allergic hypersensitivity. The top-level organizing nodes representing hypersensitivity, allergy, and non-allergic hypersensitivity are referred to as conditions (representing disease states), dispositions (propensities to develop a reaction), and processes (pathological processes underlying the reactions). The disjunctive nature of these conditions is modeled using general concept inclusions (GCIs).  Hypersensitivity conditions, including allergy and non-allergic hypersensitivity, are defined in terms of a pathologic process relationship to specific processes in the qualifier value hierarchy.

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Hierarchical view of the hypersensitivity pathological processes as available in SNOMED CT International Edition version 20220831.

Allergic Conditions

Allergic conditions are defined as kinds of hypersensitivity diseases, propensities, and reactions with an immunologic basis and are modeled with a pathologic process of the Allergic process (qualifier value) hierarchy. Allergic process (qualifier value) is a child of both the Hypersensitivity process (qualifier value) and Abnormal immune process (qualifier value), and thus allergic diseases and reactions, unlike their non-allergic counterparts, will classify under both Hypersensitivity condition (finding) and Disorder of immune function. 

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Diagrammatic representation in stated view of concept 419375001 |Allergic reaction caused by oil (disorder)|as in the International Edition version 20220831.

Intolerance

Intolerance (to a substance) is a propensity to an adverse reaction, which is not an allergy or a non-allergic hypersensitivity, and may be idiosyncratic and/or individually specific (as noted in FHIR® Release 4).

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Diagrammatic representation in stated view of concept 782197009 |Intolerance to substance (finding)|as in the International Edition version

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