Finger prick A 1c versus Blood drawn lab work?

Just wondering because today I got a A1 c (my third one) and they pricked my finger instead of taking blood, I asked the doc if it made any difference and he said not an any medical study’s, and gave me the option of getting blood taken, I declined, So wondering you all thought?

I use the home A1C kit you can get in the drugstore and I have heard it is 95% accurate which I think is equal to the lab. If the lab is higher, someone will say so, but 95% is good enough for me. It comes two to a box and I think I’ll do my next one on World Diabetes Day.