What diseases are primarily detected by antinuclear antibody tests?
Disease description:
I feel unwell and have been advised to undergo an antinuclear antibody test. I would like to ask, what diseases does the antinuclear antibody test mainly check for?
Doctor's answer (1)
Dr. Yang Ziqi
Antinuclear antibodies (ANA) are primarily used to detect autoimmune diseases, especially connective tissue diseases, such as systemic lupus erythematosus (SLE), Sjögren's syndrome (SS), polymyositis or dermatomyositis (PM/DM), and systemic sclerosis (SSc).
ANA refers to a group of autoantibodies produced against DNA, RNA, proteins, or molecular complexes of these substances within the cell nucleus. A positive result suggests the possible presence of an autoimmune disease. Different ANA components have distinct clinical implications—for example, anti-dsDNA antibodies indicate SLE activity, while anti-SS-A and anti-SS-B antibodies are helpful in diagnosing SS. Therefore, ANA testing is an important step in diagnosing autoimmune diseases.
Definitive diagnosis must be made through comprehensive analysis integrating the patient's symptoms, physical signs, and other auxiliary examinations.
