> ## 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

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

An allergy/intolerance record represents a patient's allergy or intolerance to a substance. This includes details about the allergy/intolerance, its clinical status, and any reactions that have occurred.

**Reference Table:**

The `allergy_intolerance_references` table contains normalized references from the allergy/intolerance to other entities. It supports the following reference properties:

* **patient** (required): links to the [patient](/medical-api/handling-data/schema-v000/patient) who has the allergy/intolerance
* **encounter**: links to the [encounter](/medical-api/handling-data/schema-v000/encounter) where the allergy/intolerance was recorded
* **recorder**: links to the [practitioner](/medical-api/handling-data/schema-v000/practitioner) who recorded the allergy/intolerance
* **asserter**: links to the [practitioner](/medical-api/handling-data/schema-v000/practitioner) or [patient](/medical-api/handling-data/schema-v000/patient) who asserted the allergy/intolerance

For detailed information about reference table structure and indexing, see the [Reference Tables documentation](/medical-api/handling-data/schema-v000/reference-tables).

**Allergy Intolerance Table:**

**Primary Keys:**

* allergy\_intolerance\_id

**Foreign Keys:**

* patient\_id

| Column                            | Data Type | Description                                                 |
| --------------------------------- | --------- | ----------------------------------------------------------- |
| allergy\_intolerance\_id          | varchar   | Unique identifier for the allergy/intolerance               |
| patient\_id                       | varchar   | Unique identifier for the patient                           |
| clinical\_status\_hl7\_code       | varchar   | HL7 clinical status code                                    |
| clinical\_status\_hl7\_display    | varchar   | Human-readable description of clinical status               |
| source\_clinical\_status\_code    | varchar   | Original clinical status code from source system            |
| source\_clinical\_status\_display | varchar   | Original clinical status display from source system         |
| source\_clinical\_status\_system  | varchar   | Original clinical status system from source system          |
| snomed\_code                      | varchar   | SNOMED CT code for the allergy/intolerance                  |
| snomed\_display                   | varchar   | Human-readable description of SNOMED CT code                |
| source\_code\_code                | varchar   | Original coding code from source system                     |
| source\_code\_display             | varchar   | Original coding display from source system                  |
| source\_code\_system              | varchar   | Original coding system from source system                   |
| onset\_date                       | date      | Date when the allergy/intolerance began                     |
| meta\_source                      | varchar   | Source document filename from FHIR meta.source              |
| data\_source\_ext                 | varchar   | Integration source of the data, derived from FHIR extension |

**Related Tables:**

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