Why get tested?
As part of an investigation of a bleeding or thrombotic episode. To help evaluate your risk of excessive bleeding prior to a surgical procedure. To monitor heparin anticoagulant therapy

When to get tested?
When you have unexplained bleeding or thrombosis (a blood clot). When you are on heparin anticoagulant therapy. Sometimes as part of a pre-surgical screen

Sample required?
A blood sample is drawn by needle from a vein in the arm