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Serotonin is a neurotransmitter important in the transmission of messages between nerve cells. Serotonin helps us maintain a "happy feeling" and calms anxiety. It also plays a role in the wake-sleep cycle.
Normally, serotonin is present in small varying quantities in the blood. Large quantities of serotonin may be produced by carcinoid tumors that form in the gastrointestinal tract.
This blood test is used as an aid to diagnose carcinoid syndrome; a combination of symptoms caused by the release of serotonin into the blood stream by these tumors. Typical carcinoid symptoms include:
Fasting is not required. Take all medications as prescribed.
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