2nd October 2019


Why is PT high?

For some who have a high risk of a blood clot, the INR needs to be higher - about 2.5 to 3.5. A prolonged PT means that the blood is taking too long to form a clot. This may be caused by conditions such as liver disease, vitamin K deficiency, or a coagulation factor deficiency.

Likewise, can heparin affect PT INR?

Having a too high an INR means blood clots won't form quickly enough, which increases your risk of bleeding and bruising. Having too low an INR means the warfarin dose is too low and blood clots could still develop. The Partial Thromboplastin Time, or PTT test, is most often used for patients on Heparin instead of INR.
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