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Test of. Blood plasma [1] 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]
Lupus anticoagulant is an immunoglobulin [ 1] that binds to phospholipids and proteins associated with the cell membrane. Its name is a partial misnomer, as it is actually a prothrombotic antibody in vivo. The name derives from their properties in vitro, as these antibodies increase coagulation times in laboratory tests such as the activated ...
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.
Lupus erythematosus is a collection of autoimmune diseases in which the human immune system becomes hyperactive and attacks healthy tissues. [ 1] Symptoms of these diseases can affect many different body systems, including joints, skin, kidneys, blood cells, heart, and lungs. The most common and most severe form is systemic lupus erythematosus .
Fresh normal plasma has all the blood coagulation factors with normal levels. If the problem is a simple factor deficiency, mixing the patient plasma 1:1 with plasma that contains 100% of the normal factor level results in a level ≥50% in the mixture (say the patient has an activity of 0%; the average of 100% + 0% = 50%). [3]
Patients with drug-induced lupus erythematosus typically have positive tests for anti-histone antibodies but do not have indications for anti-dsDNA antibodies. Patients with idiopathic systemic lupus erythematosus have both types of autoantibodies present in their blood. Thus, this test can be useful in distinguishing these two illnesses. [9]
Lupus band test. Microphotograph of a histological section of human skin prepared for direct immunofluorescence using an anti- IgG antibody. The skin is from a person with systemic lupus erythematosus and shows IgG deposits at two different places: The first is a bandlike deposit along the epidermal basement membrane ("lupus band test" is ...
The ISI is usually between 0.94 and 1.4 for more sensitive and 2.0–3.0 for less sensitive thromboplastins. [ 5 ] [ 6 ] [ 7 ] The INR is the ratio of a patient's prothrombin time to a normal (control) sample, raised to the power of the ISI value for the analytical system being used.
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