The A1c Test Gives More Weight to What Your Average Glucose Levels

Three weeks ago and my A1C came back at 7.0 and I was placed on Lantus. I had only been on insulin for two weeks when I had additional lab work at my internal specialist's office. Unbeknownst to me, in addition to a liver function test and fasting lipid test, he also ran an HbA1C which came back at 6.2. I've been watching my numbers closely and can not see where they would have dropped enough that in two weeks my A1C would have gone from 7.0 to 6.2. Why the rapid decrease in such a short amount of time?

I know the A1c test gives more weight to what your average glucose levels have been in the closer-in-to- the-test- date weeks. IOW, when you went on insulin and things started to normalize, those couple of recent weeks swung the result into a surprisingly low number. The only other thing I can think of is that even the most dedicated tester only tests 8 or 10 times a day, probably not at all during the night, for instance. So it's impossible to get a true average from your home meter, not in the way you can with the A1c test. Other than that, I'm clueless, but maybe others will have some other ideas. Whatever, I'm glad to hear you're doing better.