Was great to see almost 30 people and great discussion about measurement hierarchies and measurement-unit pairs. If you missing the call, slides and recording are available in the Files in Vocabulary subgroup Teams channel.
Bottom line: Polina and others worked hard to link some of the LOINC and SNOMED measurements in one hierarchy so that you can select a SNOMED code + all descendants to get a nice measurement concept set, but you still always need to look at the concept set closely since the hierarchy is not comprehensive. A great opportunity to collaborate to create more links (as @MaximMoinat pointed the gap with SNOMED red blood cell count and LOINC erythrocytes count)! If you have good measurement concept sets where you caught gaps in hierarchies - send it our way 
Another bottom line: everybody knows measurement-unit pairs are a pain, in ETL and in cohort construction. It would be awesome to know which units go with which measurements potentially leveraging amazing work by @Vojtech_Huser here and N3C/@stephanieshong work here. Thanks @DaveraG for a great question and hoping to talk more about in Themis (@MPhilofsky).