Health IT & Interoperability

HL7Health Level Seven

A family of standards for exchanging clinical and administrative health data between systems.

Reviewed June 2026 by Enterprise Health

Key facts

  • A family of health-data exchange standards.
  • v2 messaging carries labs, orders, immunizations and ADT.
  • FHIR is HL7's modern, API-based standard.

What it means

HL7 standards — most commonly the v2 messaging used for labs, orders, immunizations and ADT (admit/discharge/transfer) — are the lingua franca of health-data exchange. Occupational-health systems use HL7 to receive lab results, exchange immunization data with state registries, and connect to clinical EHRs. FHIR is HL7's modern, API-based standard.

Frequently asked

What is HL7 used for?

Exchanging clinical and administrative data between systems. HL7 v2 messages are the common way occupational-health systems receive lab results and exchange immunization data with state registries.

Is FHIR part of HL7?

Yes — FHIR is HL7's modern, API-based standard, complementing the long-established v2 messaging still used for labs, orders and ADT feeds.

A certified, interoperable system of record.

See how Enterprise Health exchanges data using HL7, FHIR and the standards your stack already speaks.