A normal value for anticardiolipin antibodies is negative, which means that this antibody is not present. If anti-cardiolipin antibodies are detected as positive, which means that a value is present, it means that there is a difficulty with possible anti-cardiolipin antibody-related disease. This is an autoantibody that uses negatively charged cardiolipin on platelets and endothelial cell membranes as a target antigen. It is one of the antiphospholipid antibodies, the hallmark antibodies of the antiphospholipid antibody syndrome, but the latter is mostly a high titer of anti-cardiolipin antibody and lasts for more than 12 weeks. Positive anti-cardiolipin antibodies are also seen in other rheumatic immune diseases such as systemic lupus erythematosus, rheumatoid arthritis or dry syndrome. Positive anti-cardiolipin antibodies can also be seen in viral infections such as adenovirus, rubella virus, varicella virus, mumps virus, and other diseases such as the mycoplasma system, and oral administration of certain specific medications such as chlorpromazine.