Ok googled and found this explanation of what it is.

ANA Test

It is also known as an antinuclear antibody test and is designed to detect antinuclear antibodies in the sample of blood. The acrnym ANA refers to antinuclear antibodies that are automatic in a sense that they automatically bind to certain surfaces within the nucleus of cells.

While a healthy person should possess a certain amount of antibodies to guard against invading bacteria, antinuclear antibodies work against this self defense mechanism. In fact, a high level of antinuclear antibodies present may indicate that the immune system is capable of mistakenly launching an attack on healthy tissues. This condition is known as autoimmunity.

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