I know that in general they look for antibodies that are in the CSF that are not in the blood, so both have to be looked at and that's usually the ANA and Og Bands. A lot of those profiles are indicative of other conditions/diseases, used more for rule out purposes. I.e RBC in the CSF would not indicate anything one way or the other about MS, but coupled with other tests, may lead to other conclusions.
Jon
Are you asking about the spinal fluid? Or the blood?