Mat, "I was reading about findings of paired 'o' bands in CSF".

Oligoclonal antibody bands in CSF are often strongly diagnostic of multiple sclerosis - from memory this does not apply to you (?).

Oligoclonal antibody bands in plasma but not CSF can indicate a range of B cell neoplasia (multiple myeloma among others).

If you are concerned about this you could get your rheumatologist to arrange to check this out - it is easy to do and could put your mind to rest about it.