Lupus Anticoagulant (LAC) is an antibody found in the blood that is linked to an increased risk of excessive blood clot formation. The Lupus Anticoagulant test checks for these antibodies, which can lead to a blood clotting disorder. This test is often prescribed when a person experiences recurrent miscarriages, as the presence of lupus anticoagulant may interfere with normal pregnancy progression by causing clotting in the placenta. Detecting LAC can help guide treatment to reduce the risk of complications.