I have a mechanical heart valve and have been self testing my INR since 2012 with a Coaguchek. I have always used the yellow Accu Chek XL lancets, but now they have been discontinued. I have been given white Accu Chek lancets but they have a smaller gauge so they produce less blood. Now I keep getting Error 5 messages because the lancets are unsuitable for INR testing, they are designed for blood glucose checking.
Has anyone else had this problem, or got any lancets they recommend?