HL7 v2 messages carry ADT admissions, ORU lab results, ORM orders, and SIU scheduling events across your EHR, lab, and billing systems. The challenge is bridging these pipe-delimited feeds into modern FHIR-based platforms securely and reliably.
HL7 standards define how clinical and administrative data travels between healthcare systems, from patient demographics to lab results to prescriptions. Each version takes a different approach to structure and transport. Here’s how they differ:
HL7 v2.x is the most widely deployed standard in healthcare today. It uses pipe-delimited messages to carry ADT (admissions), ORM (orders), ORU (results), and SIU (scheduling) events between EHRs, labs, and devices.
HL7 v3 was designed to resolve ambiguities in v2.x by introducing XML-based messages and a formal Reference Information Model. It brings stricter semantics and vocabulary binding, making data meaning explicit rather than implied by context.
FHIR is healthcare’s current data exchange standard. It uses RESTful APIs and JSON, supports real-time queries, and works with web and mobile apps. Most systems run HL7 v2 for legacy feeds and FHIR R4 for new integrations.
We design and build HL7 integration solutions mapped to your actual workflows not a generic template. Our engineers configure custom interfaces for EMR/EHR systems, billing platforms, labs, and specialty apps, handling message-level logic for ADT, ORU, ORM, and SIU event types.
We build HL7 interface engines that move clinical data reliably between your systems. Each interface handles message parsing, transformation, and ACK/NACK acknowledgment giving healthcare providers accurate, consistent data exchange built to their specific EHR configuration.
We connect your core systems with third-party applications billing clearinghouses, lab vendors, pharmacies, and specialty tools over HL7 v2.x messages. Integrations include real-time event-driven updates to improve clinical decision making.
We build HL7 viewer tools that parse and display v2.x messages inside your EHR environment. Engineers can inspect segment-level data MSH, PID, OBX, ORC without manually decoding raw pipe-delimited feeds.
We migrate HL7 interfaces from v2.x to current standards, including v2-to-FHIR R4 bridging. Every upgrade includes compatibility testing and ACK/NACK validation before go-live, keeping your exchange aligned with ONC requirements.
We run end-to-end testing across HL7 interfaces and data pipelines parsing, transformation, routing, and acknowledgment. Our process surfaces edge cases before go-live: segment-level errors, missing required fields, and message timing failures.
Connect EHRs, labs, imaging systems, and billing platforms so clinical data flows accurately between all systems in your organization.
Link EHR, imaging, and billing systems to reduce manual data entry and handoff delays freeing clinical staff from duplicate work across disconnected platforms.
Give care teams real-time access to patient history, lab results, prescriptions, and treatment plans across all connected systems.
Standardize data formats, codes, and transmission protocols so patient information stays consistent and accurate as it moves between systems.
Meeting HL7 standards keeps your data exchange aligned with ONC Cures Act requirements and HIPAA transmission rules protecting patient data and reducing compliance risk.
Add new EHRs, labs, or billing platforms without rebuilding interfaces from scratch standardized HL7 messaging speeds up every new system you connect.
Talk to our HL7 integration engineers about your ADT, ORU, or ORM interface, EHR-to-FHIR bridge, or version upgrade. Get a scoped timeline and connector fit for your systems in one call.
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See how ConnectHealth's pre-built connectors handle ADT, ORU, and ORM mapping, ACK/NACK validation, and v2-to-FHIR bridging so your team isn't maintaining interface logic by hand.
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Read MoreHL7 (Health Level Seven) is a set of international standards for transferring clinical and administrative data between software applications. The most used version is HL7 v2, which sends ADT, ORU, ORM, and SIU messages between EHRs, labs, and pharmacy systems. FHIR a newer HL7 standard uses RESTful APIs instead of messages. Most systems run both: HL7 v2 for legacy feeds, FHIR R4 for modern integrations.
HL7 messaging is the mechanism HL7 v2 uses to transfer clinical events between systems. Each message is triggered by a real-world event admission, order, result and carries structured segments (MSH header, PID demographics, OBX observations). The receiving system parses the pipe-delimited fields and maps them to its internal data model. HL7 v2 remains the backbone of most hospital interface engines: Mirth Connect, Rhapsody, Cloverleaf.
HL7 is used to exchange clinical and administrative data between disconnected systems. ADT fires on admissions, transfers, discharges. ORU carries lab and radiology results. ORM transmits orders. SIU handles scheduling. Every time an EHR, lab, pharmacy, or device shares patient data with another system, HL7 v2 or FHIR is typically the transport layer.
Mapping mismatches between HL7 segments and the target system's data model; version differences (v2.3 vs v2.5.1); ACK/NACK gaps that let failed messages go undetected; maintaining interfaces as EHR upgrades change message formats. Moving to FHIR adds complexity: OBX-to-Observation, PID-to-Patient mapping at the resource level.
Custom: 4–12 weeks depending on message complexity, EHR vendor certification, and testing scope. On ConnectHealth (pre-built connectors to 20+ EHRs), the same connection can go live in days. Also depends on scope: single ORU back-feed vs full bidirectional ADT/ORM/ORU implementation.
HL7 v2 uses pipe-delimited messages over MLLP. FHIR uses JSON/XML over RESTful HTTP. HL7 v2 is event-driven; FHIR supports both event-driven and query-based access. Most orgs need both HL7 v2 for existing EHR feeds, FHIR R4 for new apps and ONC Cures Act compliance. The two can be bridged with a v2-to-FHIR translation layer.
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