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Switching Meters - Page 4


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Old 03-20-2016, 20:02   #31
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Dug out my old meters out of curiosity:
Accu-chek activ is totally dead although I still have some expired strips. Probably not going to replace that battery. Strips were expensive.
ReliOn bg=119,
Bionime bg=120,
TRUEread bg=120 with strip that expired Oct 2013!
Who knows how accurate they are, but at least at this moment they all agree.

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Old 03-20-2016, 20:23   #32
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Quote:
Originally Posted by majoie View Post
dug out my old meters out of curiosity:
Accu-chek activ is totally dead although i still have some expired strips. Probably not going to replace that battery. Strips were expensive.
Relion bg=119,
bionime bg=120,
trueread bg=120 with strip that expired oct 2013!
Who knows how accurate they are, but at least at this moment they all agree.
hold on to those meters!

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66 Years
DX: 9/2009 A1C=10.7
A1C 2/2010: 6.7 (DX + 4 months)
A1C 5/2010: 6.0 (DX + 8 months)
A1C 8/2010: 5.7 (DX + 11 months)
A1C 11/2010: 5.1 (DX + 14 months)
A1C 9/2011: 5.6 (DX + 2 years)
A1C 7/2012: 5.5 (DX + 2 years 10 months)
A1C 1/2019: 5.5
Diet: Approximately C:10;P:15;F:75 (as % calories)
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Old 03-23-2016, 18:34   #33
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Default I think i got it!

We're back together! I've un-divorced my two best meters. Amazing turnaround (3 readings so far, so I hope so).

First clue:
On day I tested forgetting that I had just fought with a green coconut to get it open for someone and hadn't washed my hands. It was two hours after lunch. The OneTouch read 104, but the FreeStyle read 141, 35% higher and a number I NEVER see at that time.

So, I thoroughly cleaned my hands and re-tested. Here's where it gets weird. The OT came up to 125 and the FS came down to 126, just 1 point apart and a believable number. It seems that the coconut contaminated skin made the OT lower and the FS higher and the re-test was almost exactly the same.

Second clue:
Someone on here mentioned wiping the first drop and squeezing out another before testing. Freer of stuff on the skin or which came from it, I guess.

What I did:
Made bigger drops and tested the FS first making sure I just touched it to the top of the drop, not close to or touching the skin.

Results (only 3 so far):
Before dinner: OT 92, FS 94
Before Breakfast: OT 86, FS 88
Before Dinner: OT 83, FS 86

This after 40 tests where FS was always 5 - 15% (average 11%) above the OT. Now 3 in a row 2-3 point apart.

I'm happy that it seems the OT was the correct one, of course since it was lower of the two! But, it seems that strips touching the skin, which was happening much more with the FS than the OT, causes the FS to read higher than true and the OT to read lower. Over the years the OT has been very consistent and predictable except for sporadic low readings, maybe once or twice a month.

I was wondering how I could do a meaningful OGTT (coming soon) with two meters so far apart. I hope this continues!

Any more weird readings and maybe I'll try to second-drop method.

So, sorry meters, you're not as awful as I thought. My bad.

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DX: 9/2009 A1C=10.7
A1C 2/2010: 6.7 (DX + 4 months)
A1C 5/2010: 6.0 (DX + 8 months)
A1C 8/2010: 5.7 (DX + 11 months)
A1C 11/2010: 5.1 (DX + 14 months)
A1C 9/2011: 5.6 (DX + 2 years)
A1C 7/2012: 5.5 (DX + 2 years 10 months)
A1C 1/2019: 5.5
Diet: Approximately C:10;P:15;F:75 (as % calories)
Exercise: Not much. Stairs at home & work.
NO MEDS, No Highs, No Lows
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Old 03-24-2016, 20:36   #34
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Six readings so far with new technique: don't let Freestyle strip touch skin, take from top of drop.

FS is still always higher than OneTouch, but in all six readings it was either 3 or 4 points higher, no more no less. I love consistency. I have a lot more confidence in these meter readings now.

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Salim Morgan, T2
66 Years
DX: 9/2009 A1C=10.7
A1C 2/2010: 6.7 (DX + 4 months)
A1C 5/2010: 6.0 (DX + 8 months)
A1C 8/2010: 5.7 (DX + 11 months)
A1C 11/2010: 5.1 (DX + 14 months)
A1C 9/2011: 5.6 (DX + 2 years)
A1C 7/2012: 5.5 (DX + 2 years 10 months)
A1C 1/2019: 5.5
Diet: Approximately C:10;P:15;F:75 (as % calories)
Exercise: Not much. Stairs at home & work.
NO MEDS, No Highs, No Lows
Grandkids: 22
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Old 03-25-2016, 16:16   #35
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I received the TRUEresult meter yesterday and tested with it and the Relion throughout the day and this morning. The TRUEresult is lower than the Relion, and from what I remember of the FreestyleLite meter I used to use, the TRUEresult is more in line with it. From the beginning of using Relion I felt it was too high, and the readings from it were higher than my A1C of 4.9 would warrant.

TRUEresult/Relion

.81/115
.94/108
117/124
.98/126
105/120
.98/117

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Old 03-25-2016, 19:23   #36
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Regarding Meter/strip accuracy:

Most people rarely use the control solution to check their meters/strips. Here's the way I check and adjust my testing process:

The control solution is a constant. Meters and strips I've found will vary according to temperature; cold - higher readings - warm - lower readings.

On your test strip bottle there will be a control test range. On my current OneTouch bottle that number is 115-153mg/dL. That means that when you use the control solution in a test...anything between 115-153 is a viable number. Therein lies the 15% of accuracy that the manufacture is given. In other words...you add 115 and 153 together, then divide it by 2 and you get 134. 134 minus 15% equals 114. 134 plus 15% equals 154.

So, this means that 134mg/dL is what that meter and test strip ideally should read if you use the test solution at the right ambient temperature.

Now, let's say I test a new bottle of test strips at the ideal temperature range. That range being the middle of the allowed temperature ranges for the meter and test strips. For my meter it's 43 to 111F...but my test strip bottle says 'Store test strips in vial only, below 86F'. Anyway...

Let's say I use the control solution to test a new bottle of test strips. The control solution test comes out 141mg/dL. Since the bottle reads 115 - 153 that means that the strips for that bottle read 7 points higher than what they should be...or, 5.5%.

From then on, when I test my whole blood, I figure that test is about 5.5% higher than it should be for that bottle.

As to temperature differences; In January I kept getting higher readings than usual. Couldn't figure out why. Using my usual method of Sherlock Holmes' deduction - "When you eliminate the impossible whatever remains, however improbable, must be the truth." I concluded it must be the temperature.

Upon rising in the morning, room temperature of 55F I took a FBG test. 132mg/dL. I waited an hour and took another test. 131mg/dL. The next day...did the same thing. FBG tests remained similar.

The next day I took a FBG test and it read 138mg/dL. I put the meter and the bottle of test strips in my pants pocket for an hour. My hour-later FBG test? 110mg/dL. Same thing the next day. I call that empirical evidence.

FWIW

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Old 03-27-2016, 16:57   #37
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Well, in my case, method of testing made a huge difference.

Here the percentages of Freestyle Lite over OneTouch Ultra where I just squeezed out enough blood to test.

20.45
11.39
5.06
14.81
7.41
19.77
18.48
-4.17
7.38
16.67
13.64
6.54
1.64
5.49
12.38
-3.30
17.86
10.23
21.18
8.79
11.46
21.95
13.73
1.11
4.49
20.00
13.79
4.40
14.42
4.40
35.58
0.80
5.13
17.17
17.07
16.67
16.28
5.61
18.29
11.36

Average: 11.64

Here they are after I changed the method. I just squeezed out a bigger drop and carefully let the Freestyle "suck" from the top of the drop making sure not to touch the skin. The Freestyle is still nearly always higher, but within an acceptable range. Here's the same percentages after changing the method:

2.17
2.33
3.61
3.19
4.40
3.77
-5.79
0.83
9.20
3.00
5.10

Average: 2.67% Higher

The OneTouch doesn't seem to be affected by this at all. In fact, once when I accidentally tested when my skin was contaminated with coconut water, the FS went much higher and the OT went lower, as confirmed by subsequent testing after washing hands.

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66 Years
DX: 9/2009 A1C=10.7
A1C 2/2010: 6.7 (DX + 4 months)
A1C 5/2010: 6.0 (DX + 8 months)
A1C 8/2010: 5.7 (DX + 11 months)
A1C 11/2010: 5.1 (DX + 14 months)
A1C 9/2011: 5.6 (DX + 2 years)
A1C 7/2012: 5.5 (DX + 2 years 10 months)
A1C 1/2019: 5.5
Diet: Approximately C:10;P:15;F:75 (as % calories)
Exercise: Not much. Stairs at home & work.
NO MEDS, No Highs, No Lows
Grandkids: 22
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Old 03-27-2016, 21:37   #38
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Quote:
Originally Posted by smorgan View Post
Here the percentages of Freestyle Lite over OneTouch Ultra where I just squeezed out enough blood to test.
About that "squeezing". There are other fluids in your skin besides blood capillaries. They're called interstitial fluids an can skew your test result as much as surface contamination.

When you lance your finger...or wherever you're drawing blood from...just a light squeeze is all that should be necessary. Otherwise you'll get interstitial fluids along with your blood droplet. Causes of having to give a hard squeeze range from too shallow of a lancet depth to being dehydrated.

I know we all try to lance our fingers at the shallowest depth possible because the deeper the lance...the more pain it seems you get. But really...what I think we should strive for here is a test as accurate as we can get. I don't know...maybe put a leather bit in your mouth, bite down hard...and then pull the trigger!

Edited for speling.

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Old 03-29-2016, 11:05   #39
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Quote:
Originally Posted by Bounty View Post
About that "squeezing". There are other fluids in your skin besides blood capillaries. They're called interstitial fluids an can skew your test result as much as surface contamination.

When you lance your finger...or wherever you're drawing blood from...just a light squeeze is all that should be necessary. Otherwise you'll get interstitial fluids along with your blood droplet. Causes of having to give a hard squeeze range from too shallow of a lancet depth to being dehydrated.

I know we all try to lance our fingers at the shallowest depth possible because the deeper the lance...the more pain it seems you get. But really...what I think we should strive for here is a test as accurate as we can get. I don't know...maybe put a leather bit in your mouth, bite down hard...and then pull the trigger!

Edited for speling.
Interesting. What's even more interesting is that it affected one meter much more and differently than the other. The Freestyle was VERY consistently higher with squeezing and/or contact between strip and skin while the OneTouch was either unaffected or read LOW.

They do use two very different methods to analyze the blood, so I suppose it's possible.

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Salim Morgan, T2
66 Years
DX: 9/2009 A1C=10.7
A1C 2/2010: 6.7 (DX + 4 months)
A1C 5/2010: 6.0 (DX + 8 months)
A1C 8/2010: 5.7 (DX + 11 months)
A1C 11/2010: 5.1 (DX + 14 months)
A1C 9/2011: 5.6 (DX + 2 years)
A1C 7/2012: 5.5 (DX + 2 years 10 months)
A1C 1/2019: 5.5
Diet: Approximately C:10;P:15;F:75 (as % calories)
Exercise: Not much. Stairs at home & work.
NO MEDS, No Highs, No Lows
Grandkids: 22
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Old 03-29-2016, 20:32   #40
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Quote:
Originally Posted by smorgan View Post
They do use two very different methods to analyze the blood, so I suppose it's possible.
When I was diagnosed in 2009 the pharmacy gave me a free Bayer Contour BG testing kit. Charged Medicare for the 100 strips, of course. That meter gave values in whole blood...as did most of the information I gleaned from the Internet in those days.

A year later, when most meter manufactures were giving away meters, I changed to an Accu-Chek Compact Plus. Same deal...gave values in whole blood. You get used to those values and adjust things accordingly.

In 2013 Medicare forced me into a different meter...the TRUEresult. Values read higher...so I tried to adapt. Started using more Lantus. Numbers came down...my weight started going up. Months later...I found myself in the Owner's Booklet and in System Specifications came across Result Value: Plasma values. What the...who the...what?

Plasma values? What the heck are those? I go to Google and find it's the values used by a lab...because they actually test your blood using its plasma - spun from whole blood. I find a conversion table on the Internet and find out my new TRUEresult plasma readings match my old Accu-Chek whole blood readings and readjust my Lantus units. Weight-gain problem solved.

There's still a boatload of diabetes information on the Internet that gives reference to blood glucose test values...but little of it says whether it uses whole blood or plasma values.

I still use the old information, i.e. organ damage usually starts above 140mg/dL. If my meter reads 150mg/dL one hour after a big meal...I don't worry about it...150mg/dL in plasma values converts to 133.9mg/dL in whole blood values.

In regards to conversion: I don't much care for the metrification of the USA. I can no longer walk into a liquor store and ask for a fifth of Jack Daniel's. Now it's 750mL. At least I can still buy milk by the quart and eggs by the dozen. And...a 9/16 12-point box-end wrench will slip and bust your knuckles on a 14mm bolt every time.

My favorite line in the 1994 film Pulp Fiction. Vincent Vega (John Travolta) tells Jules Winnfield (Samuel L. Jackson) that "Europe is a little different, because for example in Paris, they don't call it a 'Quarter Pounder with Cheese' but a 'Royale with Cheese' as they've got the metric system, they don't know what the (expletive) a Quarter Pounder is."

I also long for the days when it was a quarter to 12...not 11:45!


edited for speling

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Last edited by Bounty; 03-29-2016 at 20:37.
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