@lkirnbauer Perhaps this will be helpful in your discussions with your doc. about labs, for nutrients l-arginine: CBS Sunday Morning show on 11/9, Bill Gates was interviewed about his funding for Washington University in St Louis on Alzheimer's (Gates is engaged to support finding solutions since his dad died of Alz.). In the past few days, I began reading WU of St Louis research involving Long Covid: https://stlcovidresearchhub.wustl.edu/l-arginine/ T-Cell blood labs basically identified that my auto-immune system was in overdrive, yet no other blood work indicated any 'infections'. L-Arginine as a supplement may be helpful in normalizing my TCells. I'll begin by requesting labs looking specifically at my level of L-Arginine since a body's auto-immune functions have been shown to depend on l-Arginine levels.