ANAscreen is an ELISA test system for the qualitative measurement of IgG antibodies against nuclear antigens, SS-A 52, SS-A 60, SS-B, RNP-70, Sm, RNP/Sm, Scl-70, Centromere B, and Jo-1, in human serum or plasma. The test is used for screening of patients with suspected autoimmune connective tissue diseases, e.g. systemic lupus erythematosus, mixed connective tissue disease, Sjoegren’s syndrome, scleroderma, and polymyositis/dermatomyositis.