After 10 mths of the crappiest health of my life I have become a little curt because this is a common dialogue that most every person with LC has multiple times with Doctors, Friends, Coworkers, and random commenters. However, I cannot point to a test that says LC-positive. My apologies are not sincere but I wish they were because that would mean I have my life back, apologies for that. Here are the 2 theories: 1. Totally unnoticeable case of Covid became LC, or, 2. Never had Covid but immune system did not like the mRNA jabs at all and has gone into overdrive to screw things up long-term. Have not done an antibody test yet, have had many PCR tests, including a negative one (performed poorly) soon after symptoms arose. Had neck surgery in the meantime. Got rid of the headaches and brainfog (mostly) by taking gobs of antihistamine (Allegra) a common LC suggestion. So i'll try the test you mentioned (thanks). If it's negative, it is not at all unreasonable to think the mRNA vaccine has had this horrible inflammation effect. In the beginnings of mRNA technique research this was a big issue, maybe it's been solved for the vast majority but 1% which is millions are not liking the approach of turning your own system into a spike protein production plant. So what's frustrating is that nobody is looking at this stuff. I am not an antivaxer, I'm probably the opposite, I have access to great resources, but it doesn't mean there's zero chance of some harm to some people.