I was in hospital recently and the anti-coagulation people said I should get my home Coaguchek XS meter, which I have had for about 6 years, calibrated. They could not do this. I phoned the helpline who said that calibration was not necessary as there is a new chip with every new test strip pack. However the person was a bit vague. Does anyone else know anything about calibrating home meters? There is a scheme for calibrating NHS meters which will get much more use, but not home ones.