Hello minimii 
An ANA of 1:320 is quite high enough to support a lupus diagnosis assuming there are other signs and symptoms of lupus, and to merit further testing for more specific antibodies. That's because an ANA at that titre is rarely found in the healthy population and although ANA is not specific to lupus, lower titres would be expected if it was due to other conditions.
I say 'lupus' but I mean autoimmune connective tissue diseases like lupus and lupus variants. It is listed as a classification criterion for lupus and in practice is also a diagnostic criterion as so few people have lupus without having a significantly high ANA.
You should make a list of all your current health problems, your complete health history and a note of the chronic health problems of close blood relatives, not leaving anything out of either just because you don't think it is relevant.
Good Luck with your rheumy appointment - let us know how it goes please !

Clare
An ANA of 1:320 is quite high enough to support a lupus diagnosis assuming there are other signs and symptoms of lupus, and to merit further testing for more specific antibodies. That's because an ANA at that titre is rarely found in the healthy population and although ANA is not specific to lupus, lower titres would be expected if it was due to other conditions.
I say 'lupus' but I mean autoimmune connective tissue diseases like lupus and lupus variants. It is listed as a classification criterion for lupus and in practice is also a diagnostic criterion as so few people have lupus without having a significantly high ANA.
You should make a list of all your current health problems, your complete health history and a note of the chronic health problems of close blood relatives, not leaving anything out of either just because you don't think it is relevant.
Good Luck with your rheumy appointment - let us know how it goes please !
Clare