What is Interoperability?
Interoperability is the ability of different information systems, devices, and applications to access, exchange, integrate, and cooperatively use data in a coordinated manner.
Levels of Interoperability
1. Technical Interoperability (Foundational)
- Establishes basic interconnection between systems
- Ensures data can be transmitted from one system to another
- Example: TCP/IP networking protocols
2. Syntactic Interoperability (Structural)
- Defines data format and structure
- Ensures receiving system can parse the data
- Example: HL7 message structure, XML schemas
3. Semantic Interoperability
- Ensures meaningful interpretation of data
- Uses standardized terminology and value sets
- Example: SNOMED CT codes, LOINC codes
4. Organizational Interoperability
- Addresses business processes and governance
- Ensures proper authorization and workflow
- Example: Direct Trust agreements
Key Standards Enabling Interoperability
Transport Layer
- HTTP/HTTPS (RESTful APIs)
- SOAP/WSDL (Web Services)
- MLLP (Minimal Lower Layer Protocol) for HL7 V2
- TCP/IP sockets
Data Format Layer
- XML (Extensible Markup Language)
- JSON (JavaScript Object Notation)
- EDI (Electronic Data Interchange)
- CDA (Clinical Document Architecture)
Semantic Layer
- SNOMED CT (clinical terminology)
- LOINC (lab and clinical observations)
- RxNorm (medications)
- ICD-10 (diagnoses)
Application Layer
- FHIR (modern API-based exchange)
- HL7 V2 (traditional messaging)
- DICOM (medical imaging)
- Direct (secure email-like messaging)