Thirty five years, but I did have one close call. I have had 3 op hospital surgeries (r ankle, left knee replacement, r shoulder rotater cuff, but these went quite smooth. About 10 years ago my
prothrombin time INR jumped to well over 12.5, and I started having internal bleeding (coughing up blood), and blotchy bood spots all over my legs. My doc called me and told me to go right in the er. While in the hospital the attending nurse came and asked me how I was feeling and I told her my INR was over 12. She told me that's a mistake because the INR cannot go over 10, which I said was bs. I told her I just had it measured yesterday and it was 12.5, and that was before taking my medicine that evening following the blood draw. She Drew my blood right there at the hospital and sort of snickered and said she'll be back with results in a few hours. She came back and told me "you are right sir it is over 12, in fact it's 12.7 as I speak. I have never heard of blood being that thin in my entire life, until it happened to me. I am lucky I didn't have some sort of major repercussion like hemorrhaging in the brain or something? Lol, I am a bit wacky when I stop and think about it
. What I think caused the blood level to rise so quickly so high was that I stopped a particular medicine cold turkey when I should have eased off of it. That medicine is Xanax. I had been taking Xanax for about 5 years to help me sleep, and wanted to get off of it so I stopped it cold turkey. I think it shocked my system and that's exactly the time my blood levels skyrocketed. Naturally, I stopped taking my Warfarin until the blood levels were subdued, and they also gave me some vitamin K tablets to hasten the procedure. In about three or four days my INR was back to normal and I have never had a problem since.
Edit: there's nothing wrong with taking xanax, just be careful when stopping it after an extended time of use.