{"id":11474,"date":"2026-02-15T02:10:57","date_gmt":"2026-02-15T00:10:57","guid":{"rendered":"https:\/\/medilab.km.ua\/?p=11474"},"modified":"2026-04-20T18:53:25","modified_gmt":"2026-04-20T15:53:25","slug":"serotonin-level-tests-when-necessary-and-what-results-they-show","status":"publish","type":"post","link":"https:\/\/medilab.km.ua\/en\/serotonin-level-tests-when-necessary-and-what-results-they-show\/","title":{"rendered":"Serotonin Level Tests: When Are They Needed and What Do the Results Show?"},"content":{"rendered":"
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\n 5\/5 - (320 votes) <\/div>\n <\/div>\n

Analyses on serotonin level<\/a> \u2014 are laboratory tests that help assess the concentration of serotonin in the blood and identify possible metabolic disorders of this biologically active amine. Despite the popular belief that serotonin is a \u00abhappiness hormone,\u00bb its role is much broader: it affects the functioning of the nervous system, sleep regulation, appetite, pain sensitivity, intestinal function, and vascular tone.<\/p>\n

For patients, a serotonin level test may be part of an examination for suspected neuroendocrine tumors, chronic mood disorders, or unexplained digestive symptoms.<\/p>\n

What is serotonin and where is it produced?<\/h2>\n

Serotonin (5-hydroxytryptamine) is a neurotransmitter that is synthesized from the amino acid tryptophan. About 90% of serotonin is produced in the intestinal cells, not in the brain. Therefore, its level can affect not only the emotional state, but also the functioning of the gastrointestinal tract.<\/p>\n

The main functions of serotonin:<\/p>\n