I wonder if plasmapheresis would lower it . . . more than just transiently (ie., for at least a few months)?
Or better yet would cause a lasting reset to a new, lower level.
Do you know if there are readily available, well-validated tests for CXCL-9 that one's doctor could order through a university health system diagnostic lab, for example or Mayo?
I've had plasmapheresis and I will probably have it again. I did an extensive panel of bloodwork before and after the procedures, but I'm pretty sure CXCL-9 was not included. It would be very interesting to test CXCL-9 level before and after (say a month after) a series of plasmapheresis procedures.
Finally, I wonder if the Conboys tested for this in their post-parabiosis, mouse experiments involving plasma exchange with albumin? Remember they saw profound rejuvenation effects by simply removing "bad" old blood components (as opposed to adding beneficial young blood or young blood components). Maybe CXCL-9 reduction in part explains the rejuvenation effects they saw when they simply removed plasma and replaced it with saline and albumin?