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Differences in readings on different blood glucose monitors?

I was just diagnosed with gestational diabetes 2 days ago so I am really new to all of this. I was at my parents last night for Christmas eve and took my blood sugar 2 hours after dinner, it was 234 which seemed high to my mom so she got my dads meter and tested me on that one and it said 186, I was curious about the different numbers so I got another one of his out and it said 134. Why would three monitors give such different numbers? I would be able to understand a 10-20 point difference but not 100! I have to keep track of these numbers for 1 week and then see my doctor to again so she can look at them and we can discuss if I need insulin.. It seems like with the differences in numbers I could be put on insulin for no reason or at least more then I would need. I tested with mine and one of my dads this morning and the numbers where only 11 points apart. What would have caused a 100 point difference within a 1 to 2 minute time frame? Do you think my meter might be wrong??

Update:

Thank you for the well wishes! Mine came with one bottle of the control stuff and I did use it, the numbers where supposed to be between 180 and 230 and it was 194 so it came up within range. That confused me too since it seems like it should have been an exact number and not a range. I will take it with me next week and have them take a look :)

10 Answers

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  • Willie
    Lv 6
    10 years ago
    Favorite Answer

    Use only the same meter each and every time. Make sure your control has been done on the meter. Blood sugars will vary. You health practitioner wants to see an average and using more than one machine will not give a true picture. Best wishes.

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  • 4 years ago

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  • 4 years ago

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  • 10 years ago

    There's going to be variation from meter to meter, but also from minute to minute. If these three tests all occurred within a couple minutes, then that's quite a gap and probably outside the meters' margin of error range. To give you an idea, on one meter I got 110 mg/dL and on another I got 75 mg/dL. I called both meter companies complaining and they both said that those results weren't outside the meter's accuracy range and that there was nothing they could do for me other than send me another meter. If you tested your blood sugar over half an hour, then it's possible your blood sugar dropped.

    Next time, try to test your blood sugar at the same time from the same drop of blood. A side-by-side comparison will be more indicative.

    It's possible, too, that the third meter had old test strips or just wasn't working.

    You did the right thing by re-testing. If you're unsure, you should test again. In general, though, I try to take the first reading I get because I drive myself crazy otherwise.

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  • Gary B
    Lv 7
    10 years ago

    HOME blood glucose meter are NOT as accurate as you think. No, you WILL NOT get one specific reading, even when using the "control" liquid. Why?

    1) The meter itself has an accuracy of about +/- 10 points

    2) The control liquid is NOT designed to one specific number, so any particular bottle of solution may fit anywhere within that range.

    3) The control liquid has an expiration date. If the bottle is close to that date, the number will be slightly different. If the bottle is expired, then the reading could be totally wrong.

    4) All control liquids are NOT the same! Use ONLY the brand of control liquid sold by the manufacturer of the meter. DO not mix manufacturers.

    5) The test strips have expiration dates. if the TEST STRIPS are out of date, THEIR readings will be wrong, too.

    There SO many variables between meters that your "method" of testing with several different meters would be judged a WRONG THING TO DO. get ONE meter, and stick with it. DO NOT be concerned about any other meters except your own.

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  • 5 years ago

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    RE:

    Differences in readings on different blood glucose monitors?

    I was just diagnosed with gestational diabetes 2 days ago so I am really new to all of this. I was at my parents last night for Christmas eve and took my blood sugar 2 hours after dinner, it was 234 which seemed high to my mom so she got my dads meter and tested me on that one and it said 186, I...

    Source(s): differences readings blood glucose monitors: https://tinyurl.im/Y5VOF
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  • 10 years ago

    Have the various glucose meters been calibrated recently, my friend?

    They may have come with two bottles of liquid that is used for ensuring accurate results.

    If they have been calibrated recently, how old was the calibration liquid that was used on them. Unfortunately, it does make a difference as the liquids tend to 'go off'.

    Might I suggest that you take your own meter along with you to your next antenatal appointment and ask that they check the calibration of the meter. Explain to them that you'd checked your blood glucose level using your own and your father's blood glucose meters, and that you'd received wildly different readings.

    I wish you well, dear lady, for comfortable and successful pregnancy. Congratulations, by the way.

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  • 4 years ago

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    If you think you have diabetes i think you should have a checkup and speak with your doctor just in case.

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  • 10 years ago

    DId you test at 2 hours after you have eaten?

    THe difference between the 234 and 186 could be 30 minutes of time honestly..

    DOn't test right after you eat..the numbers going to be higher

    The point is to see if your insulin works ..so check after 2 hours or 1 hour if you are advised for that as well as right before you eat

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  • Carlos
    Lv 4
    3 years ago

    3

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