We were inspected recently and did not have any UoM for Diamed systems, which they had no issue with. We do however have a table in the SOP listing mitergation of uncertainty for the analysers but no actual calculations and they were happy that we had considered it. I think in the standards it says to 'consider' uncertainty so we listed things like IQC, EQA, competency assesment of users, 3rd party controls, standard reagents that have a BAT etc.