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Test and Tubes Database
ID:359 Serotonin
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DescriptionSerotonin is primarily raised in classical metastatic mid-gut carcinoid tumours. It is taken up readily by platelets or converted to 5-HIAA. Whole blood serotonin is measured and related to blood platelets.
IndicationInvestigation of suspected carcinoid disease.
Additional InfoCarcinoid disease is characterised by tumours of the argentaffin cells which produce excessive amounts of serotonin. The serotonin is usually rapidly metabolised by the liver to 5-hydroxyindoleacetic acid which is excreted via the kidneys. However in mid gut tumours with liver metastases, or in foregut tumours where the serotonin drains directly into the systemic circulation, the serotonin can cause flushing, diarrhoea, wheezing and heart disease - the so called 'carcinoid syndrome'. Should be measured in conjunction with plasma 5-HIAA. Please refer to the following reference for useful information on preanalytical factors: https://www.ncbi.nlm.nih.gov/pubmed/29292526
Concurrent Testsna
Dietary Requirements

InterpretationLevels above the reference range are suggestive of carcinoid disease.

Ref. Range (Male)<7.0 nmol/10^9 platelets
Ref. Range (Female)<7.0 nmol/10^9 platelets
Ref. Range (Paed)
Ref. Range NotesLower levels may be found in elderly subjects and in patients taking SSRIs
Unitsnmol/10^9 (platelets


IP Acute TAT- Contact Laboratory
IP Routine TAT20 days
GP Acute TAT- Contact Laboratory
GP Routine TAT20 days
Turnround CommentNA
Originally edited by : . Last edited on 17/09/2019 16:35:03. Published By Robert Barski on 17/09/2018 16:35:03.