What levels may indicate "serotonin syndrome"?

Elevated serotonin levels on the Neurotransmitters test could be suggestive of serotonin syndrome. The diagnosis of serotonin syndrome should take into consideration medication and dietary supplement reconciliation and signs and symptoms, including agitation or restlessness, insomnia, confusion, rapid heart rate, high blood pressure, loss of muscle coordination, profuse sweating, diarrhea, headache, shivering, or in the case of severe serotonin syndrome, high fever, tremor, seizures, irregular heartbeat, or loss of consciousness.