Plasma Free BDNF (BDNF)
Key neurotrophin that binds TrkB receptor tyrosine kinases to promote long-term potentiation (LTP), dendritic arborization, and hippocampal neurogenesis.
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.
5.0 - 30.0 ng/mL (plasma), 15 - 45 ng/mL (serum)
General reference distribution across unselected commercial populations.
>20.0 ng/mL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Synthesized in cerebral cortex and hippocampus; exercise triggers muscular FNDC5/irisin release, driving central BDNF transcription.
Differential Diagnosis
Elevated Levels (BDNF High)
- •High neuroplastic resilience and synaptic density (>20 ng/mL)
- •Aerobic exercise-induced neurotrophin surge
Low Levels (BDNF Low)
- •Major depressive disorder
- •Chronic psychological stress and HPA axis hyperactivation
- •Accelerated hippocampal atrophy in aging
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 BDNF
- Targeted organ system imaging or functional dynamic testing related to synaptic plasticity & neurogenesis
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Plasma Free BDNF - The New England Journal of Medicine (2021). PMID: 34190124
- [2]BDNF Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Plasma Free BDNF (BDNF) into overall healthspan optimization.