Monday the 21st, my inr was 1.6 and the cardiologist changed my coumadin from 4mg per day to 6mg for 2 days, 5mg for w days and had it rechecked today 3/25 and it was 2.8.......now he has me taking 5mg on Friday and Monday and 4mg the other days and recheck on the 30th.......?????