Walmart sells a kit for home measurement of HbA1c (brand name ReliOn) that costs $9 and provides results by email. It’s sold only at Walmart. I have been paying $30 for the same measurement at a test center (about 30 minutes away). If you use insurance, copay might be $15. Without insurance, a doctor’s office test might cost $90. The reviews suggest the test has roughly the same variability and average as a lab test. A few people had trouble getting enough blood on the dots but at $9 there is plenty of room for repeat testing.
My blood sugar improved when I started to walk an hour per day and when I started intermittent fasting (eating about half as much as usual every other day). I noticed the effects with blood sugar tests but frequent HbA1c tests (say, once/week) would have been much better.
Diabetes has become an enormous problem in China, where 10% of adults have Type 2 diabetes, roughly the same as in America. Americans often think obesity causes diabetes but this doesn’t explain why smoking — which makes people thinner — is associated with diabetes. People get diabetes who don’t smoke and aren’t fat. Whether anyone who walks an hour/day gets diabetes is less clear.
Thanks to Shant Mesrobian.