Venita,
I have used an at home HbA1c test on myself. It required a LOT of blood (had to prick my finger twice and still had difficulty getting enough, it was about 10 times the amount a One Touch Ultra requires). Plus, it was not very accurate. I took two tests the same day a few minute apart. One said 5.7% (average BG about 115) and the other 7.1 (average BG about 172)%. 5.7% is considered excellent control for humans and 7.1% is consider poor control, time to change meds.
This was about 4 years ago and the tests now require less blood, but everything I've read indicates that the devices that give you results immediately still have accuracy problems. The kits that have you collect blood and mail to a lab are more accurate, but the lab would probably notice the difference between human and cat blood.