change in meters readings

By 10fluffy35 Latest Reply 2012-01-31 19:41:21 -0600
Started 2012-01-23 06:54:56 -0600

I had to go to Accu-chek avia from one touch because of insurance. This
meter is sometimes 10 points higher. I checked a couple of times both
meters before my old strips run out. Anybody else see a difference when
they had to change their meters. I know the a1c is the most important.

23 replies

Nick1962 2012-01-26 13:20:20 -0600 Report

Really guys? 20%? How have I not known about this? This is kind of a game changer for me. I have an old Precision Xtra and no where in the manual does it state that it can be off by 20%. Only if you suspect it to be off, and they say if you get readings above 300 or below 50, do they recommend testing solution. I've always found it to be fairly accurate because I can compare it to free testing at our local pharmacy. I figured it was reasonably accurate because I can usually guess my A1C within .2%

Young1s 2012-01-27 06:28:18 -0600 Report

Sounds like a pretty good meter if you're that close to accurate. Is this covered by your insurance or is it one that you purchased yourself?

jigsaw 2012-01-25 14:57:14 -0600 Report

I have 4 different brands of meters. Most have an error margin of +/- 20%. As an example, if your bg was actually 100, and you did several tests with any of these meters, Your readings could be anywhere from 80 to 120. The meter would be operating within specs. +/- 20% is what most manufacturers design into their meters. This is stated in the manual that comes with most meters including the one touch. Also, most meters are plasma-calibrated which will make it a bit easier to compare to most lab tests. Some meters are whole blood calibrated and that will alter the comparison to some extent.

Young1s 2012-01-25 21:21:58 -0600 Report

That's right. Thanks for the reminder. I remember reading that somewhere when I started getting frustrated by the meter differences. So I went back on line and found out that the One Touch Ultra Mini (that I used to use) is a plasma-callibrated meter. I couldn't find out about the Freestyle Freedom Lite (which I use now), not even in the owner's manual that I have, but I did find that it has a hematocrit range of 15-65%. Huh? Could explain why the two differed so much.

draco59 2012-01-24 08:51:01 -0600 Report

Yes, there is a difference; James is right about the ±20 points on the consumer models. The ones that we used in the hospital, when I was a Lab Tech., were Accu-chek models, but they were not available to patients. Controls were run every 12 hrs. plus every 6 months they had to be so called “calibrated” to ±2 of 5 different controls. If it didn’t comply it would be pull from service, checked again. If still out of control, it would be sent back to company. Nurses and CAN where very hard on them, no offence to any of you… (I married a nurse). I would have to replace 2 to 3 every year and that was out of a total of 6 (small hospital). So if your controls work, you’re good to go.
Just remember to keep an eye on the expiration date of the controls.

jayabee52 2012-01-23 17:39:17 -0600 Report

I have known about the change in readings from meter to meter, even among the same brand of meter. Since the FDA's standard for "accuracy" is 20 points plus or minus the actual reading, (can one even know the actual reading? because I have lab tests taken at the same time which differed?) I have viewed the tests as a general reading of how I am doing BG wise. I look at whether my BGs are rising or declining or staying the same. I don't worry if one meter matches another. If the meter I usually use tells me I am staying the same (and I've been in the normal range) I am happy, if not, i know to take corrective action.

Young1s 2012-01-23 19:14:24 -0600 Report

Exactly James. I eventually stopped comparing and decided that very same thing. Either way you test it, a high is a high and a low is a low. If my meter readings remain within what's normal for me, then that's all the better.

jigsaw 2012-01-25 15:00:28 -0600 Report

Check out my response at 3:57pm. Accurate and factual info ! (-:

jayabee52 2012-01-31 19:27:27 -0600 Report

one litte point of housekeeping, Al. I am registered on Pacific Time. And DC adjusts the time zones for where we are registered. So to find your response at 3:57 p is tough because when you posted it you were in the Eastern Time and me on the other end of the country it was 12:57p. so using the time stamp as a reference may be confusing to others not accustomed to making the adjustments for differences in time zones.

I would hate to try to do the mental math for someone like Narelle (Rellypoo) living in Tazmania or Gerie (Cavie2) in Scotland.

10fluffy35 2012-01-24 06:12:27 -0600 Report

That advice sounds just like my dr. I worry too much if my reading is not what I want
it to be. She always tell me let it go(you cant change it) and look to see what changes
for tomorrows morning reading. The more I test I let it control the rest of my day.
Its always to tell people how you feel, that understand what you are saying.

Young1s 2012-01-27 06:39:14 -0600 Report

That's why I can't wait to get back to testing 6x a day. I like to see how I'm doing throughout the day and it keeps me on the right track. If I see a reading that's on the verge of being too high, I'm able to record what occurred and correct it, if necessary. Too much time in between leaves too many unknowns up in the air for me.

Young1s 2012-01-23 09:23:13 -0600 Report

Absolutely. I had to change to Freestyle Lite from One Touch for the same reason. The difference between those were about 10-40 points at times. I experimented with different fingers on the same hand, different hand, same finger on different sides, and same finger with the same blood sample. They never matched. I later read somewhere that it's because of the different way each meter reads the sample. No two brands test the alike. What I wonder though is if there are still differences between meters within the same brand.

10fluffy35 2012-01-23 10:32:17 -0600 Report

Were the 10-40 points higher or lower than one touch. Mine were about 15, some
higher, some lower and some the same. I have two one touch and I would compare
if reading was too high. Almost the same. I have never used the solution to test.
Thank you for your reply

Oneshotbandit 2012-01-25 13:49:40 -0600 Report

Are you talking about the test solution that comes w/the strips (Accu-Check Aviva)? If so I check mine w/every new box of test strips and sometime when I question a reading. Mine are good for 3 moths after opening the solution.

Young1s 2012-01-23 10:54:32 -0600 Report

Some were higher, some lower, but never the same. I used the solution once but it was so long ago that I don't remember what the outcome was.

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