Serotonin Serum Test

Serotonin Serum Test

Quick Overview

Ordered to help diagnose and monitor treatment for a serotonin-secreting carcinoid tumor.

Test #120204


Availability: In stock

Also Known As 5-HT, Serum, 5-Hydroxytryptamine, Serum.
Preparation No fasting required. Monoamine oxidase inhibitor drugs should be discontinued for at least one week prior to collection. Check with physician before stopping any medications.
Test Results 3-4 days. May take longer based on weather, holiday or lab delays.

Serotonin, a chemical, is derived from the amino acid tryptophan. It is produced as necessary by the nervous system, mainly the brain, but also by special cells in the bronchial tubes (lungs) and gastrointestinal tract. In the blood, most serotonin, more than 90%, is found in the platelets. Serotonin helps constrict blood vessels and transmit nerve impulses, aids in the wake-sleep cycle, and affects mood. It is metabolized by the liver and its metabolites, primarily 5-HIAA (5-hydroxyindoleacetic acid, a muscle stimulant), are then excreted in the urine. Serotonin is normally present in small varying quantities in the blood, and large quantities of serotonin and 5-HIAA may be produced continuously or intermittently by some carcinoid tumors.

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