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Elevated serotonin?

Anyone else have this? Level was 327 (56-244). If it is not caused from a carcinoid tumor, what could it mean here? ((I had a few fancy scans looking for neuroendocrine tumors a year ago due to my elevated VIP (vasoactive intestinal peptide) levels. Nothing was found))

I had wondered about possible kynurenine issues here a year or more ago, so could it be indicative of an issue after all?