Hi,
I am about to have a lip biopsy done since my Neurologist suspects Sjogren's based on the fact that I have been diagnosed with UCTD with ANA positive 1:160 but SSA and SSB negative, and I have small fiber neuropathy in my arms and legs (positive QSART sweat test on 2 occasions). Apparently about 1/3 of Sjogren's patients do not have positive SSA or SSB, and for that reason lip biopsies are performed since 1/3 of the time the labs do not come back positive even though the symptoms all fit.
For me, the small fiber neuropathy is the main indicator to my Neurologist that the undifferentiated CTD diagnosed by my Rheumatologist in 2008 may actually be Sjogren's.
I will post once I get the biopsy done to give more info.
Thanks for listening. :)