Hi, thanks for the update. I hope the treatment goes well and is very effective for you. Good luck.
...with the R in RU meaning 'Relative".
Or sometimes they just translate the old numbering system to a different scale, so that it's easier for the docs to assess at a glance.
"My results are 6.9 u/ml and the positive range is 3.0 u/ml and above... but everything I have seen is that positives are 20 and above."
Yep, almost always the u/ml should be positive at >20. Your test must be using something different, perhaps it's new-ish.
Here's an example which is not yours, but it is different than usual and positive cutoff is 5RU/ml. At least it shows there are other approaches: https://www.euroimmun.com/documents/Indications/Autoimmunity/Rheumatology/CCP/EA_1505_D_UK_A.pdf
Can you post an image of the test report, completely anonymized? You can upload images to your profile page.