Thanks so much for the info. My PCP (who tries, but knows nothing about LC) ordered a SARS CoV 2 Spike Antibody test. I had requested this type of testing, but didn't know what should be ordered....have a feeling he should have ordered something more comprehensive. Anyway, the Spike AB Dilution was 12,118 U/ml (normal range < 0.8 U/ml). I am 2.5 years out from my last vaccine, 2.5 years out from the bout of Covid that led to Long Covid/POTS/ME, and almost 2 years out from my second bout of Covid. So given the info you've shared, 12,118 seems quite high at this stage. I'm trying to find info, but not coming up with much -- and despite living in Boston and seeing a long list of doctors, I have NOT found a Long Covid specialist (yes, we have a couple LC Clinics associated with area hospitals but they are all a chaotic mess). If you're willing to answer a couple of questions, I'd appreciate it. Just for perspective, am I correct that 12,118 is high and may indicate a persistently high level of spike proteins in my system? And, do you think I should request any other tests? I'm going to follow up on the micro clot testing information that you provided. I just did a study on mitochondrial dysfunction, and am waiting for the muscle biopsy results and have been able to have an invasive CPET and autonomic testing, all of which show significant abnormalities. Anyway, thanks again and look forward to any insights you may have.