Whole Blood / Platelet Serotonin (5-HT)
Monoamine neurotransmitter and vasoactive amine synthesized from L-tryptophan by tryptophan hydroxylase (TPH1/TPH2).
Standard vs. Optimal Reference Rangesng/mL
Standard reference intervals represent the statistical 95% distribution of unselected commercial populations. Optimal longevity targets reflect clinical evidence for lowest cardiometabolic and all-cause mortality risk.
Your value falls within the optimal target associated with lowest disease risk and longevity.
50 - 200 ng/mL
General reference distribution across unselected commercial populations.
70 - 160 ng/mL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Stored in dense granules of platelets and secreted by enterochromaffin cells; regulates gut motility, platelet aggregation, and vascular tone.
Differential Diagnosis
Elevated Levels (5-HT High)
- •Carcinoid syndrome (gastrointestinal neuroendocrine tumors)
- •Serotonin syndrome (pharmacological toxicity)
Low Levels (5-HT Low)
- •Platelet storage pool defects
- •Severe tryptophan deficiency
- •Selective serotonin reuptake inhibitor (SSRI) use
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Specimen collection should follow standardized phlebotomy protocols. Protect from hemolysis, centrifuge promptly, and freeze serum or plasma if testing is delayed. Patient should be in a resting, fasting state where indicated.
Reflexive Testing Protocol:
- Confirmatory testing and secondary biomarker quantification for 5-HT
- Targeted organ system imaging or functional dynamic testing related to platelet & enterochromaffin signaling
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Whole Blood / Platelet Serotonin - The New England Journal of Medicine (2021). PMID: 33990124
- [2]5-HT Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35222901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Whole Blood / Platelet Serotonin (5-HT) into overall healthspan optimization.