Research Tracker›Biomarker Atlas›Major Depressive Disorder›BDNF

BDNF in Major Depressive Disorder

BDNF is a neurological marker reported as reduced in Major Depressive Disorder when patients are compared with the reference group of the cited comparison (MDD patients vs healthy controls). The source does not tie this marker to a specific symptom cluster, so it is best read as a biological signal rather than a symptom predictor. The evidence summarised here comes from Nobis et al. 2020 and reflects averages across cohorts rather than any single patient's result.

↓ ReducedNeurological

Summary

Direction in Major Depressive Disorder↓ Reduced — lower than in the comparison group
CategoryNeurological
Compared againstMDD patients vs healthy controls
SourceNobis et al. 2020 — doi:10.3390/jcm9123793
Condition atlasMajor Depressive Disorder Biomarker Atlas

Other conditions where Brain-derived neurotrophic factor (BDNF) is reported

See the cross-condition hub: Brain-derived neurotrophic factor (BDNF) across conditions.

Related Neurological markers in Major Depressive Disorder

Full list: Major Depressive Disorder Biomarker Atlas.

Frequently asked questions

Is BDNF high or low in Major Depressive Disorder?

Reduced. Studies summarised in the OSMF atlas report lower BDNF in Major Depressive Disorder than in the reference group of the cited comparison (MDD patients vs healthy controls). Source: Nobis et al. 2020.

Which test measures BDNF?

The atlas record does not list a standardised clinical test code (LOINC) for BDNF, which usually means it was measured with research assays or study-specific protocols rather than a routine clinical panel. Check the cited source for the exact method.

Is one abnormal BDNF result diagnostic of Major Depressive Disorder?

No. No single biomarker is diagnostic of Major Depressive Disorder. BDNF findings come from group comparisons, overlap considerably between patients and controls, and vary with study design, timing and comparison group. A result should be interpreted by a clinician alongside symptoms, history and other tests.

Is BDNF specific to Major Depressive Disorder?

No. The same marker is also reported in Gulf War Illness in this atlas, so it reflects shared biology (for example inflammation or vascular stress) rather than a condition-specific signature.

Cite this page

Open Source Medicine Foundation. (2026). BDNF in Major Depressive Disorder: direction, evidence and what it means. OSMF Research Tracker. Retrieved October 7, 2026, from https://research.opensourcemed.info/biomarkers/major-depressive-disorder/bdnf.html
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Last reviewed: 2026-07-03 · Page generated from major-depressive-disorder.json · Browse: Major Depressive Disorder atlas · Biomarker Index · All marker pages

Disclaimer: This page is an educational synthesis of published, peer-reviewed research and is not medical advice. Biomarker findings vary across studies with case definitions, comparison groups, timing and assay methods. Direction of change reflects the predominant finding in the cited source and does not establish a diagnostic threshold. Discuss any test result with a qualified clinician.