Hello @dallas, You will notice that we changed the title of your discussion to better describe what the discussion is about and to make it easier for other members with questions or experience to find. @edwardh posted a link with more information on the topic that explains more about the condition. Here's another interesting reference although it is from 2007.

--- Macrocytosis: pitfalls in testing and summary of guidance: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2043457/