I'm sorry, I can't remember if you had chemo or not and when it ended.

In my case, even though the surgeons said they "got it all", I still had chemotherapy. I still had a "hot spot" in the area of the surgery which showed up on scans and in my CEA test about 6 months after I stopped chemo. Demoralizing, to say the least! It took about a year later for it to be knocked out by the chemo - apparently there are residual benefits to chemo as well as the debits. My next scan is late this month.

At one time, I had found a guide to understanding Signatera test results, but now can't find it. If I remember correctly (and I may not) that's a very low number.

There is reason to be concerned, but probably not to be fearful. Lag effect of the chemo leaving residual stuff still around can result in a positive result, and lab tests all have some margin for error/false positives and false negatives.

All the best.