Serotonin is a neurotransmitter that is involved in regulating many physiological functions, including mood, appetite, sleep, and gastrointestinal motility. It is produced in specialized cells in the brain and in the digestive system.
Testing for serotonin in the blood (serum) may be useful in certain clinical scenarios. For example, it may be ordered to help diagnose and monitor certain types of tumors that produce excessive amounts of serotonin, such as carcinoid tumors. Additionally, low levels of serotonin in the blood may be associated with certain psychiatric conditions, such as depression or anxiety, and testing may be ordered to help diagnose or monitor these conditions.
However, it is important to note that serotonin testing is not a routine test and is typically reserved for specific clinical situations as guided by a healthcare provider. Furthermore, interpretation of serotonin test results can be complex and must be done in conjunction with other clinical information and diagnostic tests.