Anyone have a clear idea what this test is for? My results - by flow cytometry - are always expressed in %'s, with no range or explanation offered. eta: the header on the results page is CD57 Results By Flow Cytometry. So maybe this has something to due with relationship to cd57 - but what is it, and so what? I know the significance that some clinicians/researchers assign to cd57 as it relates to Lyme, but why attach CD45 to that? Any insights as to what this test might be seeking would be appreciated.