I had read a bit about high HbA1cs in non-diabetics, but now I found the study reference. I haven't read the whole thing, because I don't subscribe to Elsevir, but I have read the abstract.
I found this one, which isn't the first one I found, but says about the same http://www.journalia.se/posterbarcelona5.pdf
I have also seen one that says that it's not so.