Relevant patient medical history needs to be submitted with orders for Lupus Anticoagulant testing.
Electronic orders: Upon ordering, prompts will appear asking about relevant medications such as anticoagulants, antifibrinolytics, recent transfusion history, and history of bleeding or clotting disorders.
Paper requisition: If a paper requisition is to be used, please include Patient History for Lupus Testing Form
(Click here to view/print form.)
NOTE: Anticoagulant therapy, may cause falsely prolonged PT, PTT and LA Test (dRVVT) test results.
PT or APTT mixing studies are automatically reflexed if the PT and/or APTT are unexplainably abnormal (i.e., the patient is not receiving anticoagulant therapy, does not have a vitamin K deficiency, or have a clinical condition that would cause a prolonged clotting time). LA Check (dRVVT) or 1:1 Mix (dRVVT) are reflexed as indicated. DRVVT denotes Dilute Russells Viper Venom Test.
Other non-clot based tests may be helpful (i.e. Anticardiolipin, Anti-Beta2-Glycoprotein 1) and are included in this panel.