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Can Glucometers Be Inaccurate?

A DiabetesTeam Member asked a question 💭
Randburg, ZA

I have been battling with high readings for some time now - on average 9 to 13 mmol/L, using a specific branded (well known) glucometer.

No matter what I do, what I eat or don't eat, I cannot get it lower than 8 (if I'm lucky). My average (it links to my phone to keep the stats) is 12 :( Despite living and eating healthy, and using no sugar at all.

I even replaced the meter with another from the same brand, in case the first meter was defective. Same thing - high readings, no matter what.

… read more

January 24
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A DiabetesTeam Member

Meters can fail and do, they are just little machines

Test strips could be expired or contaminated which would cause a bad reading

But if you have replaced the meter and you are still seeing similar results it is likely your blood sugar that is the problem and not the meter

If your info is correct you were diagnosed a dozen years ago

Diabetes is a progressive disease

Sometimes we get into a groove with diet, exercise, lifestyle and our blood sugar is "great" for years, then one day the Beast decides it's time to advance and your numbers rise even though YOU did nothing different

So maybe you had two bad meters or strips in a row or maybe you have simply progressed and now must take a new approach which would likely require adding medications

Most symptoms of High Blood Sugar are invisible - it destroys your vascular system quietly with no outward signs until it is so bad that the pain starts, so you can't rely on "feeling fine" as a measure of control, I sometimes feel my best when my numbers are really high

If you have at least a local Clinic you can get in for a "random blood glucose test" - if you can, take your meter and test when they do - that will give you your answer unless you know another Diabetic and can use their meter to compare

But do not ignore this

If you are averaging 12 and you have had diabetes for a dozen years you don't have time to play around. The disease will take you down quicker the longer you have had it if it gets out of control - and a 12 average is way too high and would equate to an A1C of 9.2 - that is organ damaging range

January 24
A DiabetesTeam Member

Yes, glucometers can be inaccurate. If your readings differ from laboratory results by more than 15 percent, you may need a new monitor. Continuous glucose monitors (CGMs) are also less accurate than traditional testing and may require periodic traditional blood glucose tests to confirm results. Additionally, factors like Show Full Answer

Yes, glucometers can be inaccurate. If your readings differ from laboratory results by more than 15 percent, you may need a new monitor. Continuous glucose monitors (CGMs) are also less accurate than traditional testing and may require periodic traditional blood glucose tests to confirm results. Additionally, factors like the site of the blood sample can affect accuracy, so it's best to use the same areas of the body over time.

July 22
A DiabetesTeam Member

I had the same problem. Only thing that helped was they took me off the insillin and put me on the oral meds with meraforman

January 24
A DiabetesTeam Member

@A DiabetesTeam Member You need to test both at the same time - and yes, you could go from 6.4 to over 11 in 15 or 20 minutes so you can't compare like that

What "brand" of meter do you have - if you believe it's giving you wrong readings - two meters in a row - let others know

Below (pic) is a data dump from my Libre2

At 15:55 (3:55pm) my BG was 5.4 mmols
At 16:56 (4:56pm) my BG was UP to 10.3 mmols that was in 61 minutes
At 18:08 (6:08pm) my BG was DOWN to 6.4 mmols after only 1hr 12min
(I don't take meds so that happened "naturally" or whatever you want to call it)

Blood sugar can "swing wildly" so unless you are comparing almost in the same minute or two you can't judge the accuracy

January 24 (edited)
A DiabetesTeam Member

Thanks. As I stated, at the doctor, using their glucometer, I test at 6.4.
At home, the same day, still fasting, I test 11.2.
If there's a problem with the meter (twice in a row???) then SOMETHING has to be done, fast - as most likely thousands of people out there are also getting incorrect readings.

January 24

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