If you do the Quest ANA lab with titer and reflex, you will get ICAP's (International Consensus on ANA Patterns) AC codes. These codes represent general consensus on certain patterns and what they represent. My AC codes indicated systemic sclerosis, primarily. None of the ENA antibodies cover that. I had indications of systemic sclerosis (scleroderma), systemic sclerosis/polymyositis overlap, MCTD, SLE and Sjogren's syndrome. Only the latter two might be covered by ENA.

It is lazy for a rheumatologist not to bother to get those AC codes. They can be very important.