EDI and Health Level 7 Standard

As in all industries, the fast and error-free exchange of data is crucial in the healthcare sector. In healthcare in particular, transmitting data rapidly and accurately, presenting it systematically and agilely without human errors, is of critical importance for patient care and management. HL7 (Health Level 7) is a standard established for exchanging health information between medical applications. Today, with the support of technology, this standard defines a format for transmitting health-related information. HL7 standards facilitate data sharing by ensuring the interoperability of various healthcare information systems.

Development of the HL7 Standard and the HL7/EDI Relationship

HL7 is a family of international standards developed by HL7 International, an organization founded in 1987. Developed and promulgated by HL7 International, the healthcare IT standard-setting authority, HL7 standards are de facto standards in healthcare IT; however, some HL7 users have called upon Congress to establish stronger statutory interoperability standards for the healthcare IT industry. It was developed with new standards using a multi-year balloting system in which members vote and add comments across successive voting rounds until negative comments are resolved and general consensus is reached on draft standards and Draft Standards for Trial Use (DSTU).

The relationship between EDI and HL7 represents a standard developed to specify data formats and communication standards in the field of health informatics, aiming to increase operational efficiency in the healthcare sector. Thanks to its relationship with EDI, it offers advantages in data exchange in the healthcare industry today. By combining EDI's standards for processing financial and administrative data with HL7's rules for sharing clinical and patient care data, it enables the holistic management of healthcare services.

Definition of HL7

Playing a significant role in areas such as data integration, information sharing, and electronic health records in the global healthcare industry, HL7 is a set of standards developed to standardize data exchange between healthcare information systems. Fundamentally, it is a collection of standards, formats, and definitions based on the principle of exchanging and advancing electronic health records (EHRs). The "7" in the organization's name refers to Layer 7 in the Open Systems Interconnection (OSI) reference model. Layer 7 is the top application layer in the communication model developed by the International Organization for Standardization for OSI.

Today, electronic data interchange (EDI) and Health Level 7 (HL7) protocols have become essential tools for standardizing and simplifying the transfer of health information among hospitals, laboratories, insurance companies, and other healthcare organizations. EDI is a technology that enables the electronic exchange of data between disparate systems, frequently used especially in processes such as billing transactions and patient record tracking.

Information transmitted using the HL7 standard is sent as a collection consisting of one or more messages. Each message conveys a record or health-related item of information. Examples of HL7 messages include patient records, laboratory records, and billing information.

The Importance of the HL7 Standard

HL7 is one of the most critical standards facilitating data sharing for healthcare services. It enables data integration among hospitals, insurance companies, laboratories, and other healthcare institutions. HL7's standards compatible with evolving technologies, especially FHIR, play a key role in the modernization of healthcare information systems in the future. HL7 also promotes global interoperability in healthcare IT by providing guidance on how its standards should be implemented.

Health Level 7 standards define and provide messaging and data exchange, decision support, rules syntax, and common health data definitions in clinical documents, as well as formats for EHR and personal health record (PHR) claim attachments, quality reporting, product labeling for prescription drugs, and clinical genomics.

Several HL7 standards, including the Clinical Document Architecture (CDA) and the Continuity of Care Document (CCD), are referenced in federal regulations associated with the U.S. Department of Health and Human Services program for the meaningful use of electronic health records.

Primary Objectives and Standards of HL7

HL7 provides a common language and protocols to facilitate data sharing among healthcare providers, laboratories, pharmacies, insurance companies, and other healthcare-related organizations. Thanks to these standards, disparate software systems can exchange data smoothly. Prominent HL7 Standards:

HL7 Version 2.x (V2):

HL7 V2 is one of the most widely used HL7 standards, providing a simple framework for data sharing among healthcare systems.

It offers a comprehensive format for encoding various information types such as laboratory results, patient demographics, and clinical data.

Because it is highly flexible, it is widely utilized worldwide for data exchange between systems.

HL7 Version 3 (V3):

HL7 V3 is a more comprehensive and complex standard compared to V2. Built upon data modeling, it was developed to make data sharing between healthcare information systems more accurate and structured.

However, due to V3's complexity and difficulty of implementation, it is not as widespread as V2.

Clinical Document Architecture (CDA):

A sub-standard of HL7, CDA facilitates the sharing of clinical documents among healthcare information systems.

Used especially in systems such as electronic health records (EHR), CDA can include structured (machine-readable) and unstructured (human-readable) data.

Documents such as patient reports, discharge summaries, and laboratory results can be shared using CDA.

Fast Healthcare Interoperability Resources (FHIR):

FHIR (pronounced "Fire") is HL7's most modern standard, enabling fast and effective data sharing between healthcare information systems through an approach based on web technologies.

It utilizes modern internet technologies such as RESTful APIs, XML, and JSON, offering an ideal platform for integration with mobile applications, cloud solutions, and electronic health records (EHR).

FHIR was developed to resolve the complexity of HL7 V2 and V3, providing flexible, fast, and scalable access to healthcare data.

HL7 Arden Syntax:

It is a standard used for clinical decision support systems.

It allows health information to be processed algorithmically and enables the electronic utilization of clinical guidelines.

Advantages of HL7

The role of HL7 in connecting hospital information systems is extremely significant. The use of HL7 protocols in the healthcare industry reduces the need for manual data entry. In facilitating seamless health data exchange, integration engines accelerate workflows. Sharing laboratory results, medical imaging data, patient records, and many other pieces of information electronically, quickly, and accurately saves time and allows business processes to be executed more efficiently.

While reducing the administrative workload of healthcare organizations, it contributes to the more effective use of resources. Consequently, personnel working in this area can devote effort to higher-value tasks, and cost savings are achieved. Standardization and increased efficiency in data sharing provide a significant cost advantage for healthcare organizations. Because HL7 ensures that data is shared seamlessly, it can prevent duplicate tests or procedures. At the same time, the reduction of errors stemming from manual data entry helps prevent incorrect treatments and procedures, thereby avoiding financial losses.

Different hospital units—such as laboratories, pharmacies, insurance companies, and other healthcare provider departments—can work harmoniously together thanks to HL7. With HL7 enabling different software systems to work compatibly with one another, compatible data exchange takes place during data sharing.

A standard data flow is established through HL7's EDI system. Thus, transmitting and sharing healthcare data in an accurate and consistent format is guaranteed. In other words, HL7 enables the exchange of different types of data in the healthcare sector using a shared language.

HL7 standards comply with HIPAA in the United States and similar legal regulations in other countries. With this system providing fast and reliable data sharing among healthcare professionals, patient care accelerates and the system improves.

Because privacy and data security are maintained in the HL7 system, secure sharing of patient information is supported. Accurate and immediate sharing of patient data enhances patient safety by preventing issues that could lead to irreversible errors during critical care moments. HL7 protocols offer specialized standards for maintaining control and confidentiality over patient information. Protection against data breaches and unauthorized access to patient information in the healthcare sector can be achieved through this system.

By providing data cumulatively, systematically, and accurately, the HL7 system benefits the healthcare sector using data from the same sector. Because it forms a comprehensive data source for clinical research and patient data analysis, it delivers the data required for healthcare improvement and research. Maintaining electronic health records in an orderly and standardized manner gives researchers a significant advantage in analyzing health trends, tracking disease progression, and developing treatment methods. This generally increases the quality of healthcare services and supports the development of more effective treatment methods.