As far as the different readings, not all blood cell samples are alike because not all red blood
cells carry, if any, the same amount, if any, of excess glucose
. Take one reading at the times mentioned previously in #1 above.
4. An A1c tester is the most accurate test as it measures glucose over the past 2-3 months. Why? Quite simple, red blood cells live on average 2-3 months, excess glucose attaches to new RBC's and the A1c captures this.