What does high PT and INR mean?

High PT (prothrombin time) and INR (international normalized ratio) indicate that the blood is taking longer to clot than normal. This may be due to a deficiency of clotting factors, which are proteins that help form blood clots. Vitamin K deficiency, liver disease, or the use of blood thinners such as warfarin can all cause prolonged PT and INR. Prolonged PT and INR can be a serious condition if a person starts bleeding, as it can be difficult to stop the bleeding.