Conclusion
Doctors evaluate mBDNF levels to increase the potency of treatments and improve diagnosis. For now, the diagnosis and treatment of the bipolar disorder are based on clinical examination.
References
[1] https://my.clevelandclinic.org/health/articles/22610-norepinephrine-noradrenaline
[2] https://www.webmd.com/mental-health/what-is-dopamine
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2077351/
[4] https://www.verywellmind.com/what-is-hypomania-how-is-it-diagnosed-380313
[5] https://screening.mhanational.org/content/what-mania/
[6] https://guides.clarahealth.com/what-is-unipolar-depression/