Extractable nuclear antibodies test is done on the blood to know the presence of these antibodies when a person is suffering from diseases related to them. It is used to measure the level of Anti RNP Antibodies, Anti SSA Antibodies, Anti SSB Antibodies, Anti Sm Antibodies and Anti Jo Antibodies in the blood. The disorders that are associated with the test include Autoimmune Disorder, Mixed Connective Tissue Disease, Polymyositis and Sjogren's Syndrome. The test is performed not only for the confirmation of the disorders but also to know if the body is doing well in the treatment phase or not.