> ## Documentation Index
> Fetch the complete documentation index at: https://docs.metriport.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Allergy Intolerance Reaction

> Schema documentation for the Allergy Intolerance Reaction table in the Metriport data model

The `allergy_intolerance_reaction` table records individual reactions that have occurred for an allergy/intolerance. Each allergy/intolerance can have multiple reactions.

**Primary Keys:**

* allergy\_intolerance\_reaction\_id

**Foreign Keys:**

* allergy\_intolerance\_id - links to the [allergy intolerance](/medical-api/handling-data/schema-v000/allergy-intolerance/base) table

| Column | Data Type | Description |
| - | - | - |
| allergy\_intolerance\_reaction\_id | varchar | Unique identifier for the allergy intolerance reaction |
| allergy\_intolerance\_id | varchar | Unique identifier for the allergy intolerance |
| snomed\_code | varchar | SNOMED CT code for the specific substance or pharmaceutical product considered to be responsible for event |
| snomed\_display | varchar | Human-readable description of SNOMED CT code |
| source\_substance\_code | varchar | Original code of the specific substance or pharmaceutical product considered to be responsible for event |
| source\_substance\_display | varchar | Original display of the specific substance or pharmaceutical product considered to be responsible for event |
| source\_substance\_system | varchar | Original system of the specific substance or pharmaceutical product considered to be responsible for event |
| onset\_date | datetime | Date when the allergy/intolerance reaction began |
| severity | varchar | Severity of the reaction. Possible values:<br />– <code>mild</code>: The reaction is mild in nature.<br />– <code>moderate</code>: The reaction is moderate in nature.<br />– <code>severe</code>: The reaction is severe in nature. |

**Related Tables:**

* [Allergy Intolerance Reaction Manifestation](/medical-api/handling-data/schema-v000/allergy-intolerance/reaction-manifestation) - Records of specific manifestations of this reaction


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