General description of the application HD4DP v2

Last updated: 2023-04-12 13:37

The HD4DP version 2.x Local is an electronic data capture (EDC) system: a computerized system designed for the collection of clinical data in electronic format for use in research supporting human public health policy. HD4DP (Health Data for Data providers) replaces the traditional paper-based data collection methodology and the proliferation of websites to streamline data collection and expedite the time to analysis and reporting.

Components and features

The HD4DP version 2.x Local application contains the following major components: NextGen Connect,, HD Connect (LOCAL Proxy), Local datawarehouse.

NextGen Connect

NextGen Connect is a health care integration engine that translates message standards into the standard required by the receiving system, including data formats and standards like HL7, DICOM, ANSI X12, ASCII, and XML. Main functionalities are filtering, transformation, extraction and routing.

The NextGen Connect component is used to handle all integrations within HD4DP 2.0 itself but also all integrations with the external world.

Data collections API: The server offers a REST API which can be used to submit data for each known data collection. Data provider Master Systems cannot access this API directly but need to use the API exposed by the NextGen Connect component. This API is simply a proxy for the API, but allows extra features on top of the API such as security, monitoring, throttling, …

CSV API: For each data collection data can be submitted file-based using a CSV. A CSV can contain multiple data entries for a single data collection definition. These data entries are transformed and pushed by the NextGen Connect component towards the server for potential manual post-processing and validation.

HL7 FHIR API: For some data collections an HL7 FHIR API will be available. The NextGen Connect component performs the transformation towards the Data Collections API and push the data into the server.

Data delivery: the NextGen Connect component handles all routing of data towards the external world. This means it verifies the server for completed data entries which have not yet been delivered. For each data entry that needs to be delivered, it determines where to send the data to, how it needs to be transformed and how it needs to be split. It performs all these actions in a guaranteed delivery fashion: it makes sure the data reaches its destination, possibly retrying when something went wrong.

Feedback: the NextGen Connect component coordinates the receival of feedback, potentially transforming it and pushing it towards the respective data collection entry using the data collections API. is a data management platform that includes a form builder with a drag and drop interface, management of data with complete API platform, management of users, offline forms, dynamic forms, automatic creation of API, and application embedding. In HD4DP v2, an Angular frontend application is available on top of the server. This application provides a user interface to data providers in which they can see the different data collections for which they are allowed to record and submit data manually. A backend server is responsible for providing the form definitions and registrations of new/updated entries.

HD Connect (LOCAL Proxy)

The HD Connect component is used to retrieve metadata from Master Data Management Database (MDM DB) residing on side.

Local datawarehouse

Each and every change in data entries on the server is pushed towards the local datawarehouse (Local DWH) for easy reporting and data extraction. This local DWH consists of a PostgreSQL database.

Installation and maintenance

The application HD4DP v2 Local is provided without cost and installed remotely on the infrastructure of the healthcare organization by Healthcare organizations are provided the system requirements for installation of HD4DP v2 application. Healthcare organizations that cannot provide the system requirements can opt to request access and use of a HD4DP v2 Local application of another healthcare organization. Healthcare organizations that cannot provide the system requirements and cannot access and use a HD4DP v2 Local application of another healthcare organization, can request access and use of HD4DP v2 WEB hosted by

The application HD4DP v2 Local is maintained without cost remotely on the infrastructure of the healthcare organization by The infrastructure on which the application HD4DP v2 Local is installed, should be maintained by the healthcare organization.