This section documents the relevant allergies or intolerances (conditions) for that patient, describing the kind of reaction (e.g. rash, anaphylaxis,..); preferably the agents that cause it; and optionally the criticality and the certainty of the allergy.
At a minimum, it should list currently active and any relevant historical allergies and adverse reactions.
If no information about allergies is available, or if no allergies are known this should be clearly documented in the section.
The optional author and informant elements are used when necessary to convey the provenance and authoring of the section content in case it is different from what is announced in the CDA header.