Plasma and platelet levels of excitatory amino acids were measured in 38
psychiatric out-patients and in 19 comparison subjects; the patients had
DSM-III-R diagnoses of organic mental disorders (N = 3), mood disorders (N
= 15), schizophrenia (N = 13), and anxiety disorders (N = 7). The glutamate
plasma levels were significantly higher in the patients with mood disorders
than in the comparison group.