Antinuclear antibodies (ANA) are autoantibodies that target components of the cell nucleus, commonly used as a marker in diagnosing autoimmune diseases. Their presence is significant in clinical practice, as a positive ANA test can indicate conditions such as systemic lupus erythematosus (SLE), rheumatoid arthritis, or scleroderma, guiding further investigation and management. However, a positive result can also occur in healthy individuals, necessitating careful interpretation.
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