Question about meters

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Betsy12
Regular Member


Date Joined Feb 2017
Total Posts : 75
   Posted 2/11/2017 8:43 AM (GMT -6)   
Okay, due to age (51), weight (BMI upper 20's), family history, and high, but "normal" fasting glucose readings over time (mid to upper 90's), I have been self checking regularly to reassure. I've been using something cheap called the TRUE2go, and it's given me the occasional 100-110 reading, but mostly 90's. I've had it for 8 years. Looking back at lab data, it's often tested HIGHER, though I never once thought to do a test coming out of the actual lab. Most comparisons are from the general time (within a week say).

I had testing done last week, and my home meter (TRUE2go) that morning read 94. I did take an aspirin to bleed better, but the lab an hour or so later said 110. I bought a new meter called Contour next EZ, that seems to agree more with the lab. It has been giving me readings in the 105-115 range ever since. My old meter told me this morning 94 (new 106). Which do I believe? Granted, I'm already trying the good things to lower it regardless, such as weight loss, better eating, etc. But I hate not knowing! I've wasted a lot of test strips, but can say that the new definitely reads higher overall, but is also more inconsistent (106-125 on same stick!) The old tests lower, but seems to tell the same story repeatedly.

Thoughts? I also did a few (OCD) A1c home tests, that tend to favor the lower readings, but how accurate are they? Is it possible that the lab reading is the high one? Could the aspirin have affected it?

Lanie G
Forum Moderator


Date Joined Nov 2006
Total Posts : 5920
   Posted 2/11/2017 9:28 AM (GMT -6)   
Hi, no, aspirin would not have affected the result. Home meters are allowed to vary within 10 - 20% of accuracy. This may explain why our meters may not agree all the time with the lab results or even when we take our blood sugar within a minute or two at home. (It's probably the same with the home blood pressure machines.)

In the resources threads at the top of the Diabetes Forum, there are lists of the results of meter accuracy reports. I haven't found the very latest but in the fall of 2015, the Freestyle and Contour Next were the first three on the list. In any case, a home meter is better than nothing and even if it's off by a few points, it will give you trends. If you have two, you could average between the two results.

I don't know about the accuracy of the home A1c kits. WalMart used to sell their own brand, ReliOn, and the results were sent away to an independent lab for results, but I think there's another one now which gives results within five minutes at home. But, again, even if they are a few points off, I think they may give a better idea of how we're doing.
Lanie

diabetes moderator
diabetes type 2 controlled by diet and exercise and
metformin
very low carb way of eating

Check out the following site for more info on blood sugar:
www.phlaunt.com/diabetes/

Betsy12
Regular Member


Date Joined Feb 2017
Total Posts : 75
   Posted 2/11/2017 12:17 PM (GMT -6)   
20% is insane!!! I did a very unscientific math calculation, based on where I think my levels fall (from actual data) at certain points of the day, on average. I was able to estimate my A1c this way to roughly 5.5, which seems fair and matches an actual lab test from 3 years (!!) ago. 20% higher from that though is 6.6, which is not okay! I really wish I had an accurate number, other than the 110 from last week (which I don't like).

Using a regular fasting stick though, a reassuring 95 could actually be 119!!!

Lanie G
Forum Moderator


Date Joined Nov 2006
Total Posts : 5920
   Posted 2/11/2017 12:44 PM (GMT -6)   
Yes, I know but that's only if the meter you're using is not more accurate than the widest range acceptable to the RDA which regulates these appliances.

Here's some sites that address accuracy with much better explanations than I can give:

www.healthline.com/diabetesmine/why-meters-cant-tell-us-our-blood-sugar-levels#1

/www.diabetesdaily.com/blog/2013/07/blood-glucose-meter-accuracy-comparison-chart/

onedrop.today/blog/2016/05/31/bg-meter-accuracy-10-meters-put-to-the-test/
Lanie

diabetes moderator
diabetes type 2 controlled by diet and exercise and
metformin
very low carb way of eating

Check out the following site for more info on blood sugar:
www.phlaunt.com/diabetes/

Lanie G
Forum Moderator


Date Joined Nov 2006
Total Posts : 5920
   Posted 2/11/2017 12:48 PM (GMT -6)   
Also, surprisingly, taking a lot of vitamin C or Tylenol and being dehydrated or anemic can affect your blood sugar readings
Lanie

diabetes moderator
diabetes type 2 controlled by diet and exercise and
metformin
very low carb way of eating

Check out the following site for more info on blood sugar:
www.phlaunt.com/diabetes/

Betsy12
Regular Member


Date Joined Feb 2017
Total Posts : 75
   Posted 2/11/2017 1:25 PM (GMT -6)   
Affect them in which direction? I am probably always dehydrated somewhat, though I've been trying to drink more water. I had made a few recent changes in my life. One was trying a supplemental meal replacement diet program (with lots of vitamins in it) and another was that I've actually lost some weight! (I really expected a better fasting number, not worse.)

I just now took random readings on both meters, 2 hours after lunch, and the results this time were within 4 points.
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