Which message type you create depends on how the data is importing into Logician. You have a choice between coming in as Lab results, or as Test Documents. Lab results can populate flow sheets, documents cannot. Or if your organization thinks they want to have the results as a report, but also be able to trend using flowsheets, you could create a message for each.
I would guess that you would just want the text result, so that would be the MDM message. Logician does have some pretty good interface specs – that would be the place to start.