accuracy of glucos meters

By donachuk Latest Reply 2012-09-28 01:02:06 -0500
Started 2012-05-21 18:02:36 -0500

I am searching for an accuirate meter. My last meter was consistantly over 150, I thought my A-1c was going to increase? instead I went from 7.8 to 6.9. I am now considering stopping testing since bad readings are useless. I was using an accu check and am now using a liberty meter which gave me a fasting reading of 170 and later that morning I had fasting blood drawn which was 114?

Tags: devices

3 replies

rcmodelr 2012-09-28 01:02:06 -0500 Report

I'm also questioning accuracy of the Liberty Medical meters… They recently sent me a free one, said they'd refill my test strip prescription, and since I use my UltraLink with my Paradigm Revel pump, they said they'd fill my 700 strip prescription with 200 strips for the new meter, and 500 for my One Touch. They filled the strip order BACKWARDS, sent me 500 for the Liberty meter, and only 200 for the One Touch. Comparing meter readings, the two meters are fairly close when my BG is between 100 & 150, but if my One Touch meter says I'm at 150, the Liberty meter will often say I'm over 200. If I'm < 100 according to my One Touch meter, I'm usually < 60 according to the Liberty meter and my CGM AND how I feel at the time says the One Touch meter is MUCH CLOSER to my actual BG reading at the time.

I'll use the Liberty meter as a back-up, but I don't think I'll ever order more strips for it, and I'm not sure I'll ever use the strips they sent for it before they expire.

jayabee52 2012-05-22 04:53:19 -0500 Report

Which meter was giving you the readings of over 150, the accu-check or the Liberty? (I wouild suspect that the liberty meter may be the problem).

The test which is done through a lab measures your Blood Glucose (BG) in a different way from the meters, so one would expect the meter reading to differ from the lab's reading (which is itself a "snapshot" of your BG reading for that moment in time).

I would not stop testing as that is really the only best way to determine how you're doing in managing your Diabetes Mellitus (DM). As Nick said below the meters rarely give one a dead-on accurate reading, but the information is useful for showing trends in your diabetes self-care.

Additionally, an A1c is an average of what your BG has done 24 hrs a day/7days a week for 3 months.

However I have just learned that the A1c is more heavily weighted toward the average BG in the preceeding 2 to 4 weeks before it was taken. (see the first bullet pointed note in this A1c calculator here ~ )

You are comparing a "snapshot" of one BG reading in time to a "moving picture" of your BG represented by the A1c.

There is another calculator of A1c I have found, but this one has a chart of average BG numbers related to the A1c. Find that here ~

Looking at the chart there, your A1c of 6.9 corresponds to an AVERAGE BG level of 168. That is not far off the reading of 170 yousay you got with the liberty meter.

I know that it may be confusing, but your BG meter is the best tool we have currently to help us mangage our BG levels.

To stop testing would be like venturing into the sandy desert without the use of a compass. Without the compass you could really get lost and be in greater danger for complications or even death.

Blessings to you and yours!

James Baker

Nick1962 2012-05-21 20:31:27 -0500 Report

I only learned recently that meters can have a 20% margin of error. Check yours with a testing/calibration solution and see how far its off. No meter will give you a dead on reading, they're only intended to show general trends. That was hard for me to come to grips with, being as anal retentive as I am, but the information is valid. Don't stop testing, but if you're a stickler like I am, find a meter that you feel comfortable with the numbers you're getting. I have an old MediSense that seems to be accurate within 5%.
Oh and welcome to the party! Sorry you qualify for admittance, but glad you're here!