![]() About 10% of people who do not have an autoimmune disease, as well as many who have other autoimmune diseases (such as thyroid disease) also have positive ANA tests, but usually less strongly positive. However, a positive ANA test result does not by itself confirm a diagnosis for lupus. Different ANA patterns may correspond with different characteristics of lupus.ĪNA is a screening test, since almost all patients with lupus have a strongly positive test. Many laboratories also measure pattern or the way the test looks when viewed through a microscope. ANA titers at higher levels more likely indicate the presence of autoimmune disease. ANA of 0, 1+ or 2+, or at titers less than 1:80 (diluted 80 times) usually do not indicate a significant problem. ANA is usually measured as 0 to 4+ or as a titer (the number of times a blood sample can be diluted and still be positive). Laboratory tests for autoantibodies in lupus Antinuclear antibody (ANA)Īntinuclear antibody (ANA) autoantibodies, or antibodies produced by the immune system that attack the body’s own cells, are a hallmark of lupus.
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