## Devices with Multiple UDIs

PoCD devices must support UDI across devices that scale from very simple to very complex, as well as fixed configurations and dynamically (during option) additionl / removal of components.  In the more complex cases, a single device configuration may have multiple UDIs associated with the overall device and then with subsystems (even at a sensor level).  It is important that UDI information be captured in a single FHIR resource - namely Device.

<reference to UDI IG section above> 
<reference to FDA UDI documentation>

The following diagrams illustrate how to formalize UDI information as related to the general model presented below in {{pagelink:Profiles}}.

**Diagram #1**
A device with a single UDI covering all subcomponents.  
{{render:Single UDI.png}}

**Diagram #2**
A modular device with additional UDI at VMD level.
{{render:Two UDIs.png}}

**Diagram #3**
A modular device with additional UDIs at VMD and Channel level.
{{render:Three UDIs.png}}