HL7 orders via the IRIS production

Decision

The production uses EnsLib.HL7.Service.HTTPService, HS.Gateway.HL7.HL7ToSDA3, HS.FHIR.DTL.Util.HC.SDA3.FHIR.Process and HS.FHIRServer.Interop.Operation. The goal: use IRIS integration, do not rebuild it.

Two small ObjectScript classes close the gaps:

• HS.Gateway.HL7.HL7ToSDA3 is a helper, not a business host. ZHL7.OrderToSDA calls it and passes PID-3 as the patient resource ID.
• SDA3ToFHIR would create a new Patient or overwrite the existing one. The subclass ZHL7.SDA3ToFHIR skips the Patient entry.

Options

• MLLP/TCP input: the POC host exposed only the IRIS web and superserver ports. Production uses MLLP with TLS.
• Python builds the ServiceRequest: works, but bypasses IRIS interoperability.

Consequences

• Each order also creates one Organization from MSH.
• The HTTP service ACKs on receipt. An ACK does not prove that the ServiceRequest exists. Check with a FHIR search.
• OBR-4 codes the modality with DCM. IRIS maps it to the DICOM OID system.