Good advice @Superman, which I generally fully agree with. However, @Dunwanted's range appears to be 2.0 to 3.0, and he has taken a dose after the "high" result, so may be continuing on an upward path at the moment.Personally I never hold a dose. I’ll go half at most. Maybe throw some spinach on something, or just knock a milligram off.
... If a pot is about to boil over, do you turn the flame off, or just down a bit?
The Cardiologist will want to understand what is going on. One possibility is that the Warfarin effect is now stabilising after surgery only 8 days ago, and that the daily dose going forward needs to be reduced. So if stopping a dose, I would stop for one day only, and then resume at 2/3rds normal dose for the next couple of days. But the cardiologist will have more information available, and I hope will give sensible advice.