From UptoDate Patient information: "The ANA test is said to be false positive when a person tests positive but does not have any other features of autoimmune disease . This situation occurs more often in women and elderly people. Certain medications, such as hydralazine, isoniazid, procainamide, and some anticonvulsant medications increase the chances of having a positive ANA test "
Also the biologic medications like Remicade, Humira, Enbrel can cause false positive results.
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CD, Ankylosing Spondylitis, small fiber peripheral neuropathy, avascular necrosis, diffuse connective tissue disease, Sjogren's Syndrome ?