Understanding HL7 and Key Standards (v2, FHIR)
HL7: Standards, Messages, FHIR, & Examples - Medheave
Summary
HL7 is a family of interoperability standards used to exchange clinical and administrative data between multiple systems like hospitals and labs. Specifically, HL7 v2 is widely used for real-time in-hospital messaging, while FHIR is utilized for modern API integration.
Details
HL7 (Health Level Seven) is an organization dedicated to standardizing healthcare data exchange, providing standards that enable data sharing between diverse systems such as EHRs and lab systems. This guide focuses on the main standards: v2, CDA, and the modern, API-oriented FHIR. HL7 v2 remains the most widely used standard for real-time, event-driven messaging (e.g., admissions, orders) in hospital environments, using pipe-delimited text format. In contrast, FHIR is the latest standard designed for web-based exchange and app integration, utilizing RESTful APIs with JSON/XML. These standards are not replacements for one another; rather, they coexist and evolve within a single organization. The HL7 message exchange process follows a workflow: 'Event Trigger' $ ightarrow$ 'Routing/Transformation via Interface Engine' $ ightarrow$ 'Processing by Receiving System' $ ightarrow$ 'Acknowledgement (ACK)'.
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