?:definition
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Immunoassay reagents intended to perform qualitative and/or quantitative analyses on a body fluid sample (typically serum) to determine serotonin, a hormone that is a derivative of the amino acid tryptophan; it is transported in the blood by the platelets. Serotonin (5-hydroxytryptamine [5-HT]) is a neuron transmitter within the brain, with a marked influence on sleep, pain perception, social behavior, and depression. Low levels of serotonin are associated with some depressed patients (i.e., serotonin-deficient patients). High-pressure liquid chromatography assays are most widely used for determination of serotonin.
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