Why do I need a PTT test?You may need a PTT test if you:Have unexplained heavy bleedingBruise easilyHave a blood clot in a vein or arteryHave liver disease, which can sometimes cause problems with blood clottingWill be getting surgery. Surgery can cause blood loss, so it's important to know if you have a clotting problem.Have had multiple miscarriagesAre taking heparin
