glucose meter accuracy

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glucose meter accuracy


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Old 01-24-2015, 06:32   #1
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Default glucose meter accuracy

I became pre-diabetic about 4 years ago, and knocked it out
pretty quick by cutting back on the carbs. However while I was
taking care of it I had this experience with glucose meters.

I bought one on Amazon, can't remember which one but it
was rated good by other users. It seemed to me to reading
way too high, about 50 high. My lab blood work had shown
my fasting glucose to be about 112. This meter was showing
me about 160 in the morning. So I took it with me to a lab
and got blood drawn there and with the same blood draw
I took a reading with the meter. The lab results with blood
taken at the same time was about 40 or 50 lower than my
meter.

So I called the company and told them about it. After getting
quite a run around they sent me a new meter. Again I checked
the new one against the old meter. They agreed, they both
showed me really high on glucose.

At walmart they had some cheap meters so I bought a
"Reli On" for a few bucks and some test strips. This
one showed me about 40 or 50 lower than the other
two meters. So it was giving readings more like
my professional lab results. I put the other meters
aside and used this one which seemed to be pretty
accurate.

After a while, I ran out of test strips and got some more.
These had a different calibration. Maybe the first one
was F2 and these were F3, can't remember what the
number was, it was different. Now the meter when
you use it, first thing it does is identify the strip, so
it knows what calibration is being used. Now these
strips read higher than the last ones, and they read
higher than the lab did when I ran a head to head
comparison, but the difference was not too great,
maybe 10 different.

Anyway, I got the glucose under control, lost the
meters, and some years passed.

Again, my yearly blood lab showed me running up
over 111 fasting, so I bought another "Reli On"
since the last one was pretty good. First thing
I did was check it against the lab.
--------------------------------------------------------
While sitting in the waiting room at the lab,
I tested twice, like 10 and 15 minutes before
the lab test. My readings:
123
116
Next the lab test done and the result:
98
Upon leaving the lab less than 5 minutes after
my lab test, I took a third reading with my meter.
116
------------------
So this meter is showing about 18 above what
the lab shows.

Is this unusual? Anyone else getting consistantly
different readings from their meters than the lab?

Anyone got a good explanation?

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Old 01-24-2015, 06:39   #2
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Meters are permitted by law to be +/- 20% on accuracy. So the relion meters are working pretty much within that range. A more accurate system for home use with current technology would be very expensive, so we have to make do with what we have. A couple of decades ago, diabetics had to use urine strips which changed colour only above 200 mg/dl and the colour change could not really say at what reading you were.

Next time you want to check your meter's accuracy with the lab, don't use the blood sample drawn out by the lab technician. Prick one of your fingers as you would test at home. See if the numbers match up.

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Old 01-24-2015, 09:36   #4
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Also meters need to be calibrated once a year, contact the supplier for the test liquid, and if it fails the test send away for calibration.

The Relion I found to be so wildly inaccurate that it now lives at the back of a drawer, same with a Boots cheapy, the Accuchek I'm using now seems to have gone downhill since the introduction of the black chip, and higher acceptable error levels.

I'm beginning to think that they don't want us testing.

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Old 01-24-2015, 09:45   #5
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Quote:
beginning to think?
Ohh, it was obvious to me from my first visit to the doctor in Château Chinon that testing wasn't part of the plan.

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Old 01-24-2015, 18:07   #6
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Meter accuracy is something which has most of us tearing our hair out, at one time or another.

Most folks compare with a lab test, and govern accordingly, but that has to be done right, or the results are meaningless.

Multiple tests from the same drop are not a good way, either, especially with a small drop, as the drop is constantly evaporating, therefor the concentration is constantly changing.

The whole process of "testing" our meters is so fraught with sources of error, that it is best to just use them for relative values, and not absolute numbers.

Unfortunately, for those on insulin, it is a more serious game they are playing.

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Old 01-24-2015, 18:39   #7
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Quote:
Originally Posted by RCG View Post
Meter accuracy is something which has most of us tearing our hair out, at one time or another.

Most folks compare with a lab test, and govern accordingly, but that has to be done right, or the results are meaningless.

Multiple tests from the same drop are not a good way, either, especially with a small drop, as the drop is constantly evaporating, therefor the concentration is constantly changing.

The whole process of "testing" our meters is so fraught with sources of error, that it is best to just use them for relative values, and not absolute numbers.

Unfortunately, for those on insulin, it is a more serious game they are playing.
Why tear your hair out? It is what it is . . . I trust my meter that's why I choose it. And I'm insulin and I haven't had not on incident related to the inaccuracies of meter. Now sometimes I don't like to see 250 on my meter, but it is what it is. It's close enough.

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Old 01-25-2015, 09:23   #8
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This topic has been done to death elsewhere on the forum. (See links in Shanny's post) - this thread is closed.

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