Stupid blood

My PT/INR is elevated again, 4.8, so no warfarin for three days then retest next week. I was pretty sure it was high because when I brush my teeth I spit out more blood than toothpaste (sorry, gross I know) but why is it high? It's not as bad as last time but that was only a few weeks ago and I'm eating more leafy green vegetables so you'd think it would be low not high.

I don't know why I can't have some of Scalzi's SmartBlood and call it a day.