An antinuclear antibody (ANA)
An antinuclear antibody (ANA) is an antibody directed against structures within the nucleus of the cell. ANAs are found in patients whose immune system is predisposed to cause inflammation against their own body tissues. Antibodies that are directed against one’s own tissues are referred to as autoantibodies which is the more generic term and would include more than ANAs. This type of illness is called autoimmunity. ANAs indicate the possible presence of autoimmunity.