No. Having a laboratory test, any test, in isolation is generally not a good idea. By design, about 5% of the test results are false positives. Laboratory tests should be done only if clinically indicated, with the exception of a few validated screening tests.
For What? The ANA test is a test performed for certain clincial indications including the presence of lupus, other connective tissue diseases, clarify the cause of clinical symptoms to see what the most appropriate diagnosis is. It is performed to help the diagnosis. It is not done unless indicated. Doing that would not be cost efficient. The test is done to look for and confirm a diagnosis.