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IAR - Allergy Reaction Segment

The IAR segment is used to transmit a single reaction and information associated with this single reaction occurrence for a particular patient allergy (IAM – patient adverse reaction).

HL7 Attribute Table - IAR - Allergy Reaction Segment
Seq# DataElement Description Must Implement Flags Cardinality Length C.LEN Vocabulary DataType
1 03296 Allergy Reaction Code SHALL [1..1] CWE
2 03297 Allergy Severity Code SHALL [1..1] CWE
3 03298 Sensitivity to Causative Agent Code [0..1] CWE
4 03299 Management = [0..1] 250 ST

IAR-1: Allergy Reaction Code (CWE) 03296

Definition: This field identifies the specific allergic reaction that was documented. This element may conform to some external, standard coding system, or it may conform to local, largely textual or mnemonic descriptions (e.g., convulsions, sneeze, rash, etc.).

IAR-2: Allergy Severity Code (CWE) 03297

Definition: This field indicates the general severity of the allergy. Refer to User-defined Table 0128 - Allergy severity code in Chapter 2C, Code Tables, for suggested values.

IAR-3: Sensitivity to Causative Agent Code (CWE) 03298

Definition: This field contains the reason why the patient should not be exposed to a substance. Refer to User-defined Table 0436 - Sensitivity to causative Agent code in Chapter 2C, Code Tables, for suggested values.

IAR-4: Management (ST) 03299

Definition: This field contains a textual description of the actions that were performed in response to the reaction.