My father is having deep vein thrombosis or clots in right limb. Rightnow he is taking warfarin since last two months. His PT/INR is now 1.7. As in Afghanistan, the medical field and doctors are very weak. I'm worried if these clots got free and dad face any heart attack then no doctor knows how to save such a patient. My question is that what would be safer way to treat blood clots of my dad. Even if that would be outside Afghanistan, I am interested to know the treatment?