An ANA test looks for antinuclear antibodies in your blood. If the test finds antinuclear

antibodies in your blood, it may mean you have an autoimmune disorder. An autoimmune

disorder causes your immune system to attack your own cells, tissues, and/or organs by

mistake. These disorders can cause serious health problems.Antibodies are proteins that your

immune system makes to fight foreign substances like viruses and bacteria. But an

antinuclear antibody attacks your own healthy cells instead. It's called "antinuclear" because

it targets the nucleus (center) of the cells.