We

Hungarian: We (blood test)

Sometimes the abbreviations don't make sense.  Given Hungarian blood tests results, I had "We" - measured in mm/h.  So ... obviously the sed rate, right?  You'd think.  But what does "We" stand for?  The actual translation of sedimentation rate for blood is vörösvértest süllyedés.  No "W" at all - and in fact, "W" is not a letter normally used in Hungarian in the first place.

So as it turns out, We is the abbreviation used for sed rate, as confirmed by this helpful page of lab test abbreviations in Hungarian, but I still don't know its etymology.