Sorry your ananologies, personal experience and expertise is belied by what you ignored in my post:actually its an entirely correct one, you have a metabolism which allows your INR to remain stable, I do not believe this is common across even most of the community. Yet you continually brag about how "My INR is super stable" ... that's not helpful to someone to whom its not. Someone new who has as yet not realised that INR variations are the NORM not the exception.
A quick look at almost EVERY study shows that most people are not stable without intervention. You claim that you do nothing to keep it within a range of far narrower band than almost anyone in the group. Further I'm willing to bet that I have more discussions with people about their INR than you, and what I see is that such a band of 0.5INR units is impossible for most most of the time without some adjustments. You frequently claim you make none.
Your continual posting in this reguard would be like The Gym Guy saying "I bench 200kg, its easy"
Genetic predispositions matter ... height is one and so are the many and various aspects of metabolism including INR.
sorry about getting " and ' mixed up ... I hate imperial anyway ... ;-)
At least two valve product lines, from two different firms, have had studies that have shown that narrower ranges (+/-0.5 INR) are safe, can be achieved and are thus recommended. This means there are many people that can maintain that narrower range. Those are consensus opinions maybe even actual facts. Probably conservative opinions/facts given the litigious nature of US society.
Both my two cardios and former coumadin clinic do not say an 0.5 INR range is not attainable by the average Joe. They do say it requires testing and they recommend every 2-4 weeks but approve weekly testing for purposes of INR resupplies.
Those who post and contact you may not be "average" in that they have trouble maintaining an INR. Those who can maintain an INR would not be requesting the forum's or your advice since they do not need it.