What Is a Health Informatics Standard?

A health informatics standard is a formally agreed-upon specification that defines how health data should be structured, encoded, transmitted, or managed within and across information systems. It functions as the foundational grammar of clinical data exchange, enabling disparate software platforms, care settings, and countries to share patient information consistently and without ambiguity. Without such standards, electronic health records, laboratory systems, pharmacy platforms, and medical imaging archives would each encode patient data in proprietary formats that could not be reliably combined or interpreted by another system.

Health informatics standards are developed through recognized standards organizations including Health Level Seven International (HL7), the International Organization for Standardization (ISO), the International Electrotechnical Commission (IEC), and the IEEE Standards Association. Each organization focuses on different layers of the interoperability problem, from physical device communication to clinical terminology to security and privacy.

Data Exchange and Messaging Standards

The most widely deployed messaging standard in healthcare is HL7 version 2, first published in 1987 and still used by more than 95 percent of US healthcare organizations for routine data exchange. HL7 v2 defines pipe-delimited message segments for transmitting orders, results, admissions, and discharges. Its successor, the Fast Healthcare Interoperability Resources (FHIR) standard, takes a markedly different approach: FHIR represents clinical concepts as discrete, web-accessible "resources" exchanged over RESTful APIs using JSON or XML. As documented in a systematic review of FHIR implementations published in JMIR Medical Informatics, FHIR enables browser-based applications to access clinical data from any compliant health system, a capability unavailable in predecessor standards. Full replacement of HL7 v2 is projected to require years or decades given the depth of legacy deployments.

Terminology and Coding Standards

A messaging standard alone cannot guarantee semantic interoperability if the clinical terms encoded within messages carry different meanings in different systems. Terminology standards define controlled vocabularies that assign unique identifiers to clinical concepts. SNOMED CT (Systematized Nomenclature of Medicine Clinical Terms) covers diagnoses, procedures, and findings across clinical domains. LOINC (Logical Observation Identifiers Names and Codes) standardizes laboratory and observation identifiers. ICD-10, maintained by the World Health Organization, provides the diagnostic classification system used for billing and epidemiological reporting. The Office of the National Coordinator for Health Information Technology's overview of FHIR describes how FHIR's architecture is designed to carry these coded terminologies as structured payloads, binding the exchange layer to semantic content.

Device and Security Standards

The IEEE 11073 family of standards addresses medical device communication, defining protocols for transmitting physiological measurements from bedside monitors, wearables, and point-of-care devices into clinical systems. ISO 27799, developed jointly with the IEC, specifies information security management guidelines tailored specifically to healthcare organizations, addressing the particular sensitivity of personal health data and the consequences of breaches involving clinical records. Together, HL7 International's technical documentation for the FHIR specification and the ISO 27799 framework represent the two core axes of any compliant health informatics architecture: interoperability and security.

Applications

A health informatics standard has applications in a wide range of fields, including:

• Cross-institutional electronic health record data exchange
• Clinical trial data submission and regulatory reporting
• Telemedicine and remote patient monitoring platforms
• Medical device integration with hospital information systems
• Public health surveillance and disease registry systems
• Insurance claims processing and administrative data exchange