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Myelocytes are immature granulocytes (a type of white blood cells), that are usually only found in bone marrow. In essence, raised immature granulocytes are a sign of bone marrow activity. The reference range for adults who are not pregnant I found was usually 0, except for this paper: Age-dependent reference ranges for automated assessment of immature ...


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Generally these decisions are "made" by work groups of specialists in the field. Your question is very general. There are so many measurements that can be done from blood samples that there is no way I can provide you with information on exactly who decides what the reference value is. ("Who decides" makes it sound like it is arbritrary - it is not. ...


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