Two systems that cannot exchange data quietly cost a facility every day. Here is what HL7 and FHIR actually are, how they differ, and what to ask a vendor so your records are never trapped.
Interoperability is the ability of two health systems to exchange information and actually use it. It sounds abstract until you watch what happens without it. A lab produces a result and someone reads it down a phone line to a clerk who types it into a different system. A patient is referred and arrives at the next hospital with nothing but a paper note. A monthly report is built by hand because the billing system and the clinical system do not talk. Every one of those gaps is an interoperability failure, and every one of them costs time, accuracy, and sometimes safety.
The good news is that the industry agreed long ago on standards so systems could speak a common language. The two names you will hear most are HL7 and FHIR. This guide explains both in plain terms, with no assumption that you write software.
HL7, named after the organisation Health Level Seven that maintains it, is a family of standards for exchanging clinical and administrative data between health systems. The version that has been in use for decades is HL7 version 2, usually written as HL7 v2. When a lab analyser sends a result to a hospital system, or an admission triggers a message to the pharmacy, there is a good chance an HL7 v2 message is doing the work behind the scenes.
HL7 v2 is text-based and compact, and it has been quietly running hospital messaging for a generation. Its weakness is that it is old, terse, and flexible in ways that make every integration slightly different. Two systems can both claim HL7 v2 support and still need careful mapping to understand each other. It works, but it was not designed for the web, for mobile apps, or for the easy sharing the modern era expects.
FHIR, pronounced "fire" and standing for Fast Healthcare Interoperability Resources, is the newer standard from the same HL7 organisation. It was built for the modern web. Instead of compact text messages, FHIR represents health data as resources, things like a Patient, an Observation, a Medication, or a DiagnosticReport, and exchanges them over the same kind of web interfaces that power ordinary apps.
They are not rivals so much as tools for different jobs. A well-built platform speaks both: HL7 for the established device and in-hospital messaging it has to interoperate with, and FHIR for modern sharing, apps, and exchange. There is also a related family of standards, the laboratory protocols such as ASTM and LIS2-A2, that analysers themselves often speak, which a lab system has to handle even before HL7 enters the picture.
The point of a standard is not the standard. It is that your records are never trapped inside one product you cannot leave.
Interoperability is what lets a facility avoid three expensive traps. The first is vendor lock-in, where data can go into a system but never cleanly come out, so switching products means losing history. The second is the integration tax, where every new connection, to a referral hospital, an HMO, or a national platform, becomes a bespoke project with its own cost. The third is the silent re-typing of data between systems that should simply share it, which is slow and introduces errors.
For facilities reporting upward to national platforms, interoperability also underpins the statutory returns. A system that holds coded, structured data and can export it through standards makes reporting to platforms like DHIS2 far less painful, a theme we explore in our guide to DHIS2 reporting.
You do not need to read a specification to evaluate a product. A few direct questions reveal a lot.
If the answers are vague, the data is likely harder to move than the brochure suggests. If they are specific, the facility keeps control of its own records.
Veona is built as one platform, so much of the data exchange that would otherwise require integration happens internally on a shared record. Where the facility does need to reach the outside world, the platform speaks FHIR and HL7 so records, results, and referrals can move to other systems and national exchanges without locking your data in. Lab instruments connect through the protocols they actually use, and the platform is designed to report upward where ministries expect it. You can see how the connective layer is meant to work in our integrations overview and platform overview.
The takeaway: HL7 and FHIR are not buzzwords to nod past in a demo. They are the difference between a facility that owns its data and one that is quietly trapped. Ask how data gets out as carefully as you ask how it goes in.
We will show how Veona exchanges records through open standards, tailored to the systems you already run.