Hello, Yesterday, I felt ill so, I checked my blood sugar on two different meters... I knew I was very low. One meter's result was 190....the second meter result was 49..(Bayer). Since I felt very ill, I knew the 49 was the correct reading.

I tested my blood this morning at 10:25 EST. I changed the batteries in two of my meters and charged a third meter. I set up all three meters with test strips and then used the lancet on one finger. These were the results after using the blood from my finger: ULTRA2-221, Ultra Mini-210, Bayer Contour-190. Now, I have no idea what is correct and what isn't.

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Not so fast.

It is true, that if you do not do meter comparison carefully, readings will be wildly different if not done on same sample from clean area at same time. It takes some trickery. Yes once settled on meter - use it and drop all others.
I have been concistently able to compare and evaluate meters - yes no fun and a pain, but it was necessary.

All other comments aside. These meters DO NOT ACT the same on all bodies regardless and I was driven nuts till I found those meters that ON MY BODY could give reliable consistent results and do not trip up over the "total" sugar reading versus the glucose D readings the body runs on.

Hemocrit and water ranges as well as oxygen operating ranges of a meter affect how it will perform on some types of bodies. All meters here are NOT the same.

I have had meters whereby I would eat some of the trick sugars and send my readings reliably up 40 to 100 points no sweat and last 6 hours till crap rubbed out of system.

As for going low - falling BG and going high - rising BG - yes who cares on rising if it is 40 to 100 points off.

On falling BG and bg at 100 and a reading to 40 to 100 points offset is a real big deal.

Not said much today or related is the 13 folks who died due to the use of PQQ test strips used in hand held equipment in a hospital reading trick sugars causing horrendous insulin injections.

Every once in a while together with some db1 friends of mine we get a new meter so we check to see how it behaves. A friend of mine used a meter that I found measuring always 20 points lower than mine at ipo range: he said it was right for him because it matched his hypo feelings. After almost an year when his A1c didn't match his meter average readings he changed to a "modern" meter which reads alway 20% more than my (usual) meter and now he says he feels hypo according to his new meter. That's mathematically impossible, but diabetic truth !
You get used to a level of BGs and feel hypo when you go lower than usual (expecially if you go down fast as soon after a bolus).
So the only check you need to do is see if your A1c is consistent (more or less, it's a less than perfect formula) with your meter average readings of the last 3 months, according to this calculator (link).

Mine wasn't, so I'll change it next month ;-)

excellent points all. I missed commenting on A1C cross check which is very helpful and indication.

So far my A1C and related BG average from that test ends up on all my a1c tests so far as 8 points lower than the averages from cgms/caveman strip meter.

Thank you for adding additional good comment.

This blogger has results similar to mine: link to "too much to ask?"

Verio and BGStar higher than others , where is the truth ?
Tests say the first two beeing accurate and precise ....

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