This guide focuses on the selection of messaging standards to support the in scope use cases.

Messaging

The following standards were considered to communicate vaccination events and to query immunization repositories.

 

 

Standard

Fit for Purpose

Stewardship

Quality

Fits
Requirements

Implementation
Type 

Vendor Support

Canadian
Steward

SDO
Maintained

Complexity

Standard
Maturity

Training,
Support
and Tooling

CeRx HL7 V3.0 - Immunizations

Purpose Built

Production
in Canada 		High (DIS vendors)YesYesHighHighAvailable

HLv2 

Partial

No known implementations
in Canada 

High

No

Yes

Medium

High

Unknown

Architectural Constraints and Considerations

Secondary Benefits

The Canadian HL7 V3 CeRx specification was designed to support the in scope use cases in a manner consistent with the design principles of Canada's digital health blueprint.

The CeRx specification is widely adopted for drug domain messaging.

Version 3 uses rigorous analytic and message building techniques and eliminates areas of optionality that could negatively impact semantic interoperability.

Recommendation

Supporting Rationale

CeRx implementers may use the latest CeRx specification for immunization messaging. (Note that the newer HL7 v3 public health messaging supports a broader range of transactions.)The specification was designed to meet the in-scope use cases and conforms with the architectural design of Canada's digital health blueprint.
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