I purchased a new meter and got three different readings from three different meters within five minutes. My old meter (144/174/173). My new meter read (180 & 165). My neighbor's meter read (219/234/238). Why is this?
By industry standard, any given meter reading can be off by 10 to 20% from the true plasma blood glucose. If your blood glucose reading at one point in time is 145, the next reading can be 28 points higher or lower than this number and still in an acceptable range. The numbers you have provided are all within about 20% of one another, particularly 174, 173, 180 and 165. Also, the readings will not always correlate when switching from one brand of meter to another, which is probably why the readings on your neighbor’s meter were higher. Or it could be that your blood glucose was increasing due to some food or drink you were having. In any case, when looking at blood glucose meter readings, it’s important to realize that they will vary and they are not 100% accurate; however, using the same brand of meter, checking at times when the blood glucose is not changing rapidly (such as before rather than after a meal) and washing your hands before checking, are great ways to make sure your blood glucose readings are as accurate as we can get them given the current limitation of blood glucose technology.