Hi hope

I'm not sure if there is a different between cardiac AN and PoTS but there may be blood tests for antibodies that can assess? I'm just guessing, could be totally barking up the wrong tree.

I do know a bit about MIBG scans but only because I know someone whose little boy (I think he was only 4) sadly had a type of cancer which is detected by the scans. They inject you and then you return for the scan.

I hope someone else can help you you soon more.