I felt like maybe I was a bit low (I started metformin yesterday, so that’s started to kick in). All were from the same fingerstick except the last one. Still maintaining the one mmol/L difference between meters. I’ll try the next batch when I get a spike or a real low.
Interesting, about 1.5 mmol/L difference between the two this time, but otherwise still quite consistent between tests. I tested on my Contour Next USB to see what it gave me, and it said 6.3 mmol/L. I ate lunch recently, so I’m inclined to believe that the higher reading is correct. It’s too bad I don’t have some un-expired Precision strips to compare to. The interesting part of this is that, since some meters read lower than others, I imagine that it could have an impact on people’s A1c and overall control.
Yes, each time I switch meters I notice a difference. And in fact, I think that the fact that the Contour Next reads higher (in general, at least I’ve found) than One Touch is one reason my A1c actually improved.
For some reason we don’t have any deals on Amazon like you guys do. I saw 50 strips for $23 (Canadian) on Amazon.com, but they don’t ship to Canada. On Canadian sites, all I can find are 100 strips for $78. Given that these expired strips are performing pretty well, I think I’ll probably use them for swimming and my backup meter (but then, since my control is so tight right now, the 1.0 - 1.5 mmol/L difference may actually negatively affect me, so I haven’t totally decided yet!).
i appreciate your guinea pig tests; usually we leave that up to eric. but these are incredible. i am glad that you included the above mentioned disclaimer regarding different meters. i have found quite different BG readings from different meters consistently. some read “higher,” and some read “lower”. how do you choose which meter to rely upon? my only guess is that when i have my A1c done, which ever meter has proven to give me closer readings would be the more accurate one to use.
i think that the bottom line is when your feel you are crashing, and one “expired” test strip reads 120 and the other “unexpired” reads 50, you know which one to rely upon. (of course, we all know that you could be crashing at 120, too, if you are crashing from 200 )
I have compared my expired contour Next strips 2015-05, with my new batch, exp 2019-04-30 over the past week.
Used same drop of blood and 2 different Next USB meters. Also tested on my verio if there was enough blood.
Results are that the expired strips worked great.
10 strips from each batch.
New strips, average 125.4, range 106-158.
Exp. Strips, average 126 3, range 108-159.
7 of 10 were within 5 pts, 3 within 6-9 pts.
Average on competing verio meter was 120.6, and was 145 when Next tested 158, 159 from same drop. Other than that, verio was within 7 points.
But that has been my experience with verio. Most times I think it is accurate, and is in line with dexcom. But sometimes I feel I can’t trust it.
Test Strip Stability
"Stability testing protocols and acceptance criteria for the Contour NEXT EZ test strips were reviewed and found to be acceptable. The manufacturer claims shelf life stability and open-vial stability of 18 months at the recommended storage temperatures of 5-30°C."
I was happy to see the part about open-vial stability. That’s a fairly important thing. Some strips are much more fragile when they are outside.