The Continua Design Guidelines (CDG) defines a framework of underlying standards and criteria that ensure the interoperability of devices and data used for personal connected health services. It also contains design guidelines (DGs) that further clarify underlying standards or specifications by reducing options or by adding missing features to improve interoperability. These guidelines focus on the following interface: - HIS-IF - Interface between health and fitness services (HFS) and the healthcare information system (HIS) Recommendation ITU-T H.813 is part of the "ITU-T H.810 interoperability design guidelines for personal connected health systems" sub-series that covers the following areas: - ITU-T H.810 - Interoperability design guidelines for personal connected health systems: System overview - ITU-T H.811 - Interoperability design guidelines for personal connected health systems: Personal health devices interface design guidelines - ITU-T H.812 - Interoperability design guidelines for personal connected health systems: Services interface design guidelines - ITU-T H.812.1 - Interoperability design guidelines for personal connected health systems: Services interface: Observation upload capability - ITU-T H.812.2 - Interoperability design guidelines for personal connected health systems: Services interface: Questionnaires capability - ITU-T H.812.3 - Interoperability design guidelines for personal connected health systems: Services interface: Capability exchange capability - ITU-T H.812.4 - Interoperability design guidelines for personal connected health systems: Services interface: Authenticated persistent session capability - ITU-T H.813 - Interoperability design guidelines for personal connected health systems: Healthcare information system interface design guidelines