Previously I shared that my at home CoagSense showed an INR of 2.0 and at the lab my INR was a 2.5. I'm not concerned because the lab number is higher and both numbers are in range. Today when testing at home my INR was 1.8. It was lower than I expected but what caught my eye was that the PT in seconds was 21.8. I looked back at my lab numbers and a PT of that number would have given me around a 2.3 -2.4 at the lab. That is based on looking at my lab history over the last 4 visits. Would this have to do with different reagents? I'm guessing this is why I have that discrepancy between home and lab??