HL7v2: The 35-Year-Old Messaging Standard Still Powering US Healthcare

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HL7v2, or Health Level Seven version 2, is a decades-old messaging standard that enables hospitals, labs, billing platforms, and electronic health record systems to exchange clinical and administrative data in real time. First introduced in 1989, it operates on an event-driven model where actions such as patient admissions or finalized lab results automatically trigger structured messages to relevant systems. These messages use pipe-and-hat delimiters and are transmitted over TCP/IP, covering workflows like admissions, lab results, orders, scheduling, and clinical documentation. Nearly every major EHR vendor has adopted and customized HL7v2, making its interfaces deeply embedded across healthcare infrastructure. Despite newer standards emerging, HL7v2 continues to underpin the majority of healthcare interoperability in the United States today.

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