After 2 stable years of taking Warfarin everything has gone haywire. I dropped down to 1.5 . My surgery increased my dose from 5mg up to 6 mg which was fine and I very quickly got up to an INR of 3 but they insisted I stayed at 6mg. That was about 2 weeks ago.I don't have another test at the surgery for 2 weeks. I have just done a self-test and it's now 4.5 Its typical that it's Sat and I can't ask for advice. I have dropped my dose to 5mg but the question is - is that ok and I just wait to ring the surgery on Monday ?