- Study guides, Class notes & Summaries

PTT - ANSWER partial prothrombin time 60-70 seconds measures the time it takes your blood to clot. Partial thromboplastin time (PTT) is done to: Find a cause of abnormal bleeding or bruising. Check for low levels of blood clotting factors. The lack of some clotting factors can cause bleeding disorders such as hemophilia. Check for conditions that cause clotting problems. Conditions such as antiphospholipid antibody syndrome or lupus anticoagulant syndrome develop when the immun...