[Procrastes]

Just one study, but apparently not. "Plasma BDNF concentrations did not correlate with either short-term fatal outcome or type of injury following severe TBI."[1]

1. Plasma brain-derived neurotrophic factor levels after severe traumatic brain injury. https://www.tandfonline.com/doi/abs/10.3109/02699052.2015.10.... Brain Injury Journal.