according to the accu-chek site they have/are changing strips to read plasma blood rather than whole blood. This can make a 10% difference in results....
http://www.accu-chek.co.uk/gb/news/14april10.html
Did I miss the boat on this one?!?!
http://www.accu-chek.co.uk/gb/news/14april10.html
Did I miss the boat on this one?!?!