Lance I know the Doctors hail their lab tests, but honestly, I think those lab tests are more inaccurate then the machines are. I wish you could've seen some of the whacked readings I got from veinous draws. One day, two different labs, huge difference in results. I've come to the conclusion that INR is always going to make a person wonder just what it really is. Truly the reading is only good for that particular moment in time.