Serum Serotonin Level
Alternate Names : 5-HT, 5-Hydroxytryptamine
DefinitionThis is a blood test that measures the amount of serotonin.
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Why is the Test Performed?
This test may be performed when a patient has skin flushing, persistent diarrhea, and valvular heart disease, the classic symptoms that may indicate carcinoid syndrome.
Serotonin is synthesized from the amino acid tryptophan by enterochromaffin cells in the stomach and bronchi (lungs). Many patients with carcinoid syndrome will have high levels of serotonin in blood and urine.
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