What is HL7 in Healthcare?

HL7 (Health Level Seven) is a standard that allows different healthcare systems to communicate and exchange data in a consistent format.

Consider a home audio system.

You may choose speakers from one manufacturer, a receiver from another, and a media player from a third. These components work together because they use standard connection methods such as HDMI, RCA, or optical cables.

HL7 serves a similar purpose in healthcare.

It acts as the “communication standard” that allows systems from different vendors—such as RIS, PACS, EMR, and HIS—to exchange information seamlessly.

HL7 messages are structured in a hierarchical format:

• Segments – groups of related data 
• Fields – individual data elements within segments 
• Sub-fields – more detailed components within fields 

HL7 defines where specific types of data should be placed so that receiving systems know exactly where to find the information they need.

HL7 is used to transmit many types of healthcare data, including:

• ADT – Admissions, Discharges, and Transfers 
• Orders – Imaging or procedure requests 
• Results – Clinical and radiology reports 
• Charges – Billing and financial data 

While HL7 provides a standard structure, real-world implementations can vary between vendors.

In some cases:

• Data may be placed in non-standard fields 
• Systems may interpret messages differently 

This can create challenges when integrating systems from multiple vendors.

An HL7 interface engine is a tool that helps manage, transform, and route HL7 messages between systems.

It can:

• Map data between different formats 
• Modify or “normalize” HL7 messages 
• Route messages to the correct destination systems 

These tools are essential for ensuring smooth communication across complex healthcare environments.

HL7 and DICOM serve different purposes:

• HL7 → Handles patient data, orders, results, and workflow 
• DICOM → Handles medical images and imaging communication 

Together, they form the foundation of modern radiology system integration.

In radiology environments, HL7 plays a critical role by connecting:

• Hospital Information Systems (HIS) 
• Radiology Information Systems (RIS) 
• Electronic Medical Records (EMR) 
• Billing systems 

This ensures that patient and exam data flows seamlessly across the entire workflow.

HL7 interface engines can be complex and costly, but modern solutions make it possible to achieve powerful integration without excessive expense.

HL7Manager from Swearingen Software is designed to provide flexible, efficient HL7 integration tailored to real-world healthcare environments.