as in 'in general who measures it for us ..Doctors.. and some online site will do the measure i believe
for me it was doctors after requesting..3rd hba1c read and not done up until my request.
Diabetic on metformin, i doubt they would query, it's in the notes on the meds themselves that it can cause issues.
Diabetic not on met, not sure, but i'd say ask, and stress it.
if you've not been tested i'd say definitely ask for it.
it is important to know where you stand range wise, so you could take action if needed.
if the question is more
why test..then i would politely suggest reading up a little,
metformin and Age (50+) can impact T2d , B12 depletion is a serious subject..
to my mind it hit me like T2 dx did.
"oh, T2..nice ..i just take a tablet, so ill be fine"..type of way
until i read the horror stories of what T2 could actually mean.
same with B12.
it helps wraps up our nerve ending, and can contribute to serious health conditions,
possibly irreversible once we get too low.
Very interesting post/video all round, from
@Indy51
min 28.40 is the pointer here
https://www.diabetes.co.uk/forum/threads/evidence-base-for-low-carbohydrate-diet-for-type-2.170065/