- Unusually large amounts of serotonin in the circulating blood; probable cause of some of the symptoms and signs in the carcinoid syndrome.
* * *hy·per·sero·to·ne·mia (hi″pər-se″ro-to-neґme-ə) excessive serotonin in the blood or serum; symptoms may include mental status changes and hyperactivity of the autonomic nervous system; see serotonin syndrome, under syndrome.
Medical dictionary. 2011.
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