Allergy intolerance table

  • Release version: Zurich
  • Updated July 31, 2025
  • 2 minutes to read
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    Summary of Allergy intolerance table

    The Allergy intolerance [snhclsallergy] table in ServiceNow stores clinical assessment data regarding an individual's allergy or intolerance to specific substances. It records the potential risk for adverse reactions upon future exposure to these substances, supporting comprehensive patient allergy management within healthcare workflows.

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    Key Features

    • Captures detailed allergy or intolerance information linked to a patient, including allergy codes, types, categories, and clinical status.
    • Tracks criticality levels to estimate the potential seriousness of reactions.
    • Records relevant dates such as onset and when the allergy was first documented.
    • Associates allergy records with healthcare encounters and external systems via references.
    • Includes auto-generated alphanumeric identifiers for easy tracking and management of allergy records.
    • Supports configuration by users with the snhcls.admin role for customization and integration.

    Practical Use and Configuration

    ServiceNow customers can utilize this table to maintain accurate and standardized allergy information aligned with FHIR specifications. Key form fields enable categorization by substance type (e.g., food, medication), clinical status (active, inactive, resolved), and verification status (confirmed, refuted, etc.), facilitating clinical decision-making and patient safety.

    The auto-numbering feature allows customization of allergy record identifiers, ensuring alignment with organizational standards. Integrations with external EMR systems are supported through external ID and source references.

    Benefits for ServiceNow Customers

    • Enables consistent and comprehensive allergy data capture to improve patient care and risk management.
    • Facilitates interoperability with external healthcare systems using standard references and codes.
    • Supports clinical workflows by providing clear status and criticality indicators for allergy and intolerance records.
    • Allows administrators to configure and extend allergy data management to meet organizational needs.

    The Allergy intolerance [sn_hcls_allergy] table stores the information about a clinical assessment of an allergy or intolerance; a propensity, or a potential risk to an individual, to have an adverse reaction on future exposure to the specified substance, or class of substance.

    Key features

    • Stores any allergy or intolerance associated with a patient.
    • Includes the allergy code, type, category, criticality, clinical status, date recorded, and date of onset.

    Role required to configure the table: sn_hcls.admin.

    For more information, see Healthcare and Life Sciences data model.

    Table 1. Allergy intolerance form fields

    Field

    Data type

    Description

    Age of onset

    String

    Age at which an individual first experience the allergy or intolerance.

    Allergy intolerance code

    Reference

    Identifier of the allergy or intolerance.

    Category

    Choice list

    Category of an identified substance associated with the allergy or intolerance.

    The following categories are available by default:
    • Biological
    • Environment
    • Food
    • Medication

    For more information about the available categories, see allergy intolerance categories defined in the FHIR specifications.

    Clinical status

    Choice list

    Status of the allergy or intolerance under clinical trial.

    The following statuses are available by default:
    • Active
    • Inactive
    • Resolved

    For more information about the available statuses, see allergy intolerance clinical statuses defined in the FHIR specifications.

    Criticality

    Choice list

    Estimate of the potential clinical harm or seriousness of a reaction to an identified substance.

    The following types are available by default:
    • High
    • Low
    • Unable to access

    For more information about the available types, see allergy intolerance criticality types defined in the FHIR specifications.

    Date of onset

    Date/Time

    Date and time that the allergy or intolerance began.

    Date recorded

    Date/Time

    Date the first version of the allergy or intolerance was recorded into the application.

    Encounter

    Reference

    Healthcare event during which this allergy intolerance was asserted.

    External id

    String

    Identifier of the record in an electronic medical record (EMR) system.

    Number

    String

    Alpha-numeric profile identifier of the allergy intolerance.

    The value is auto-generated and is incremented every time you add a new allergy or intolerance to your ServiceNow instance. The initial value for the Number field is ALLR00001001.
    Note:
    To customize the number, define the auto-numbering format for the Allergy intolerance [sn_hcls_allergy] table. For more information, see Add auto-numbering records in a table.

    Patient

    Reference

    Patient who has the allergy or intolerance.

    Source

    Reference

    Source system details of an external healthcare system in a ServiceNow instance.

    Type

    Choice list

    Underlying physiological mechanism for a reaction risk.

    The following types are available by default:
    • Allergy
    • Intolerance

    For more information about the available types, see allergy intolerance types defined in the FHIR specifications.

    Verification status

    Choice list

    Assertion about certainty associated with a propensity or potential risk of a reaction to the identified substance.

    The following statuses are available by default:
    • Confirmed
    • Entered in error
    • Refuted
    • Unconfirmed

    For more information about the available statuses, see allergy intolerance verification statuses defined in the FHIR specifications.