I had that problem with the Accucheck products. ll read so high that I was overdosing on my insulin to many times. But IT was tehone that insurance paid for.
My first was teh One Touch Profile. my meter of choice. What we did was take a sample fo blood at teh same time the lab took it and we matched up teh readings. even Whole versus Plasma it came in only 2 points different. It remains true to that 2 point diffeernce to this day 9 years later.
The enxt one that I loved was the incharge with teh fructosamine ability. It was a shame that it was taken off teh market. It was right on target with Baptist Hospital lab every time.
I liked the freestyle original until I dropped it. Now I have the brand new freedome lite. and I love it. It reads witin 4 points of the lab.
The One touch 2 is pretty good. It reads a bit high and low versus the lab. But not enough to make me make medication adjustments.
the new colored one is flaky. It will get stuck in the 200s. So I rarley use it. When its within 65 to 75 degrees it reads great. within 5 poinst of the lab.
I found that accucheck was about 100 points too high chronically.
Now my fathers old Bayer Glucometer still reads well. within 5 poinst of lab. It was made in 1985!
My Profile can be compared to the lite and will read 3 points-5 points different highs and lows. So I knwo its accurate.
Profile to One Touch2 is a diference of about 15 points normal range differentiation between whole and plasma
Profile to accucheck 100 points higher on accucheck
Profile to Simple 5 poinst diference in temp range
Profile, freestyle ultra to Precision Xtra 5 points difference