Wednesday, April 23, 2014
Given that my daily blood sugars, both before and after eating, had improved a lot, the results from my Hemoglobin A1c test (the mail-in type from Walmart) were surprisingly high at 6.3, which is higher than my last test at the doctor's office had been a month earlier.
I was looking for possible reasons, because I thought it is unlikely that I have low fasting morning readings and fairly low levels throughout the day (usually under 110 after eating) but have an A1 c level that high. One possibility could be that the lab only received my test after almost 3 weeks and I have no idea why. When I called they said that they had not received it and the post office was 10 business days behind. After checking with my local post office I was told this was indeed possible. This may mean that the test was only done when the blood sample was too old. It is also quite possible that this would be a normal error margin for an Ha1c test, in particular from different labs.
But I found another possible answer which was on Chris Kresser's blog:
Edit: I just did some more research and found this reference about reliability of A1c tests:
I'm curious if anyone else has had discrepancies of daily readings and Ha1c values.