Lupus Anticoagulant

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Also known as: LA; Lupus Inhibitor
Formal name: Lupus Anticoagulant
Related tests: Activated Partial Thromboplastin Time (aPTT), LA Sensitive aPTT (LA-aPTT), Thrombin Time, Autoimmune Diseases, Dilute or Modified Russell Viper Venom Time (dRVVT or MRVVT), Anticardiolipin Antibodies, Antiphospholipid Antibodies, Prothrombin Time (PT)

At a Glance

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 (SLE).

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.

Test Preparation Needed?