title: Why assess vitamin-B12 status in patients with known neuropsychiatric disorder.
mesh_terms: D005069:Evaluation Studies as Topic; D006801:Humans; D001523:Mental Disorders / Q000097:blood / Q000209:etiology*; D009422:Nervous System Diseases / Q000097:blood / Q000209:etiology*; D014805:Vitamin B 12 / Q000097:blood*; D014806:Vitamin B 12 Deficiency / Q000150:complications
chemical_list: D014805:Vitamin B 12