I'm still without a diagnosis but I notice that many people have said that they had negative bloods for years before they went positive. I've just discovered after everyone had told me all the bloods were totally normal that in fact I have had a very low positive ANA (1:40, speckled pattern) about a year ago. This seems to be the first time it has even been vaguely positive. Prior to that several tests over the previous 10 years or so had been totally normal. Also complement levels, while within the normal range, were right at the bottom of the range for C3 and C4. About 7 years ago in another country I had positive anti-cardiolipin antibodies, though again they weren't sky high, but having had them tested in the UK twice in the last two years they have been in the low part of the normal range. I also had the antiDsDNA test come back normal.
Is it worth asking GP to repeat some of these tests? I'm still under investigation for neurological stuff, but I can't help wondering if I have more than one disease process going on as there is a lot of stuff that doesn't seem to be neurological as well, including a malar rash, what looks to me like livedo reticularis (but has never been seen or noticed by doctors at this point, and I can't get a decent enough photo to take to them).