Why get tested?
To help evaluate a prolonged activated partial thromboplastin time (aPTT) and/or a thrombotic episode, to help determine the cause of recurrent fetal loss, as part of an evaluation for antiphospholipid syndrome. Not a diagnostic test for lupus.

When to get tested?
When you have a prolonged aPTT test. When you have had a venous or arterial thromboembolism. When you have had recurrent miscarriages, especially in the 2nd and 3rd trimesters.

Sample required?
A blood sample is obtained by inserting a needle into a vein in the arm.