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Standardization Requirement | Options | Choice | Rationale |
Messaging | Immunization CeRx HL7 V3.0 - Immunizations | X | The specification was designed to meet the in-scope use cases and conforms with the architectural design of Canada's digital health blueprint. |
CeRx 4.4 HL7 V3.0 |
| The CeRx specification has been superseded by the Immunizations Specification for vaccine event messaging. | |
| HL7 v2 | HLv2 | Inconsistent with Canada's blueprint. Not used known implementations in Canada. |