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  1. APIs
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  1. APIs

Allergies and Intolerances

The AllergyIntolerance resource in Edvak Health EHR captures clinical information about a patient's allergic or adverse reactions to substances, including medications, foods, environmental triggers, and more. It includes details such as the substance, reaction type, severity, and verification status.
This resource conforms to the US Core AllergyIntolerance Profile, aligned with USCDI v3 and FHIR R4 standards.

Overview#

Tracks patient allergies and intolerances
Includes severity, timing, and reaction details
Supports documentation of "No Known Allergies" (NKA) or "No Known Medication Allergies" (NKMA)
Allows retrieval by patient reference or resource ID

Interpretation of No Known Allergies#

If a patient has not been asked:
AllergyIntolerance.code = 1631000175102 (Patient not asked)
AllergyIntolerance.verificationStatus = unconfirmed or omitted
If a patient has been asked and reports no known allergies:
AllergyIntolerance.code = 716186003 (No known allergy)
AllergyIntolerance.verificationStatus = confirmed

Must-Support Elements#

Each AllergyIntolerance resource must include:
clinicalStatus
verificationStatus
code (the allergen)
patient
reaction.manifestation

Search Capabilities#

Edvak Health FHIR APIs support the following allergy search capabilities:
By Patient ID – Retrieve all allergies recorded for a specific patient
By Resource ID – Retrieve a specific AllergyIntolerance record
By Patient & Clinical Status – Optional combination search
These are implemented using FHIR search parameters such as patient, _id, and clinical-status.
See individual API endpoints in this section for details.

Authentication#

All AllergyIntolerance API requests require an Authorization header:
HeaderTypeRequiredExample
AuthorizationstringYesBearer {access_token}
Refer to the Authentication & Authorization section for token handling.

USCDI Data Mapping#

USCDI Data ElementFHIR Resource Field
Substance (Drug Class)AllergyIntolerance.code (SNOMED CT)
Substance (Medication)AllergyIntolerance.code (RxNorm)
ReactionAllergyIntolerance.reaction
Modified at 2025-05-10 16:26:32
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