The ana titer usually refers to the anti-nuclear antibody test, which is mainly used to screen for autoimmune diseases such as systemic lupus erythematosus and dry syndrome. The main items of anti-nuclear antibody test include rheumatoid factor, anti-sm antibody, anti-double-stranded DNA antibody, anti-rRNP antibody, etc. It is often used to screen for autoimmune diseases such as systemic lupus erythematosus, dry syndrome, scleroderma, dermatomyositis, etc. However, if you take vitamins, it may interfere with the test results. However, taking vitamins may interfere with the test results, and some infectious diseases may also have an effect. If a positive result occurs, a complete antinuclear antibody profile is needed to make a clear diagnosis, and once a diagnosis is made, treatment should be actively coordinated.