Hi my husband is on warfarin for blood clots so it has been for the last three years and he has been stable for well over 2 years. One of his last readings was 3.7 they stopped the warfin for one day then he went to 4mg next test was 2 so he stayed on 4mg and now this one is 1.7. this testing has been over 2 weeks. Last night he was crying and he is really down so is there any link between low inr and this very out of character behaviour.