The lupus anticoagulant test is a blood test that checks for antibodies that cause a blood

clotting disorder. Antibodies are proteins in your blood that fight off bacteria, viruses, and

other germs. The name of this test is confusing because it doesn't test for lupus.Lupus

anticoagulant increases activated partial thromboplastin time (PTT) prolongation in

incubated 1:1 mix.