There is no direct link between an entry in the Clinical Data module (a Test) and any samples/vials collected during the same visit. Even if there is no clinical data available to connect to samples, it is often desirable to connect different samples and aliquots to a data level representing the sample delivery/sample extraction/patient visit or similar. One way of achieving this could be to add a link between tests and samples, another could be to add a data entity for [Occasion] or similar that can carry the connection. Among other things, this would make it easier to find and view samples over time from a specific Sample Source.
I would also find this very useful!