You know none of these tests is exact, you could have two A1C tests in the same hour, even from the same blood sample, and they might turn out with those two readings!

Also it depends who tests, my endo had an office machine, my PCP sent it out to the labs, readings were always several tenths different (my case turned out well controlled so I've just dealt with the PCP for years now, I forget which was higher).

I've been trying to lose the same five pounds for five years. In fact I have lost it several times, but it found its way back every time.