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In contrast, the prothrombin time (PT), another non-specific coagulation test, is normally unaffected by lupus anticoagulant. Nevertheless, falsely increased PT has been reported, likely by lupus anticoagulant interfering with the phospholipid component of the PT reagent, particularly when using recombinant tissue factor and purified phospholipids.
Russell's viper, Daboia russelii Dilute Russell's viper venom time (dRVVT) is a laboratory test often used for detection of lupus anticoagulant (LA). It is an assessment of the time for blood to clot in the presence of a diluted amount of venom from Russell's viper (Daboia russelii), a highly venomous snake native to the Indian subcontinent and named after the herpetologist Patrick Russell.
Distinguishing a lupus anticoagulant antibody from a specific coagulation factor inhibitor (e.g.: factor VIII) is normally achieved by differentiating the effects of a lupus anticoagulant on factor assays from the effects of a specific coagulation factor antibody. The lupus anticoagulant will inhibit all the contact activation pathway factors ...
Prolonged aPTT may indicate: [5] Use of heparin or warfarin (or contamination of the sample) Vitamin K deficiency; Antiphospholipid antibody (especially lupus anticoagulant, which paradoxically increases propensity to thrombosis) Coagulation factor deficiency (e.g., haemophilia, cirrhosis, von Willebrand disease)
Mixing studies are tests performed on blood plasma of patients or test subjects to distinguish factor deficiencies from factor inhibitors, such as lupus anticoagulant, or specific factor inhibitors, such as antibodies directed against factor VIII. [1] Mixing studies are screening tests widely performed in coagulation laboratories.
Kaolin clotting time (KCT) is a sensitive test to detect lupus anticoagulants. [2] There is evidence that suggests it is the most sensitive test for detecting lupus anticoagulants. [3] It can also detect factor VIII inhibitors but is sensitive to unfractionated heparin as well. [4]
A subset of AHAA appear to mimic the activity of lupus anticoagulant and increase Apo-H binding to phospholipids. [5] These two activities can be differentiated by the binding to Apo-H domains, whereas binding to the 5th domain promotes that anti-coagulant activity binding to the more N-terminal domains promotes lupus anticoagulant-like activities.
A coagulation blood test is used to measure and determine the blood's ability to clot and how fast it takes to clot, indicating the presence of lupus anticoagulant in the blood. An enzyme-linked immunosorbent assay (ELISA) test is done to detect anticardiolipin antibodies' presence in the blood. [ 9 ]
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