A recent blood test has shown an ANA of 1:320 with a homogenous pattern. I get tested every year or so because of my toxic exposures at the world trade center in 2001, and because many others who also responded have since developed various autoimmune diseases. I have been positive several times in the past with a 1:160 only to have a normal test the next time. This is the highest it has been. I was also tested this time and in the past for RA but that was negative. I did have one positive reading a few years ago for sjorgens, only to be negative the next two times i did it. Anyone have any suggestions for additional blood testing. Mixed Connective Tissue Disease is one thought, because of the prevalence amongst other responders, but i dont fit the symptoms.

I have Axonal Peripheral Neuorpathy with some demyelination in my feet and legs past the knees, and in my hands and wrist area which has progressed slowly but steadily for over 15 years now. Im pretty sure it has also started to affect my small fiber nerves.

ANA titres can vary by at least a factor of two, both for the same person tested in different labs and for the same person tested by the same lab.

This is because the test entails setting up a binary dilution of a serum sample. Maybe on one day an elevated titre of ANA in one person tested in one lab might be at a 1:160 dilution and the next day it might be at a 1:320 dilution for the same person tested in the same lab.

Your titres are slightly elevated but many people have titres in that range with no other signs of an auto-immune disease.

A homogeneous staining pattern can but need not indicate SLE and/or Mixed Connective Tissue Disease but usually more investigations are needed before/if a diagnosis is confirmed.

This information might help you RACGP - Antinuclear antibody test.

Thanks for the information and link.

It is not uncommon for Sjogren's marker testing to be positive one time, and negative the next. If there is any question of Sjogren's and you have typical symptoms, you should undergo a lip biopsy for confirmation or to rule it out.

That is my literal, exact same result for ANA. 1:320 homogenous pattern. I have RA - seropositive with anti-ccp antibodies and a high rheumatoid factor. Negative for sjogrens. Negative for every other autoimmune disease under the sun, including lupus. RA is controlled by meds and isn't much of an issue anymore. Small fiber neuropathy, full body, rages on and on (even with normal inflammation markers) in what I assume is an autoimmune process without a name. It's truly a big mystery but as far as I have been told, a positive ANA indicates, well, any autoimmune mechanism.

I have autoimmune disorder even though my ANA and all other immunological blood tests are negative. Have been tested for Sjogren many times it was always negative, and my lip biopsy (about 15 years ago) showed mild inflammation nonspecific to Sjogren. During these years I had a few positive borderline results which became negative when repeated a few years later.
But there is no doubt that my POTS, fatigue and probably the sensory symptoms of my SFN, are responding greatly to Rituximab and prednison.

If you had some positive RA and Sjogren blood tests in the past isn't it enough to justify a diagnosis and immunological treatment ?
In my case I got the Rituximab based on the progression of my symptoms, my response to treatments and some autoimmune disorders in my family.

My last ANA test was 1:2560.

I have small fiber neuropathy. Confirmed through 2 skin biopsies.

My neurologist tried to get me IVIG infusion therapy.

Insurance denied it. It's very discouraging. We are appealing it.