Platelet serotonin concentration in schizophrenic patients

Platelet serotonin (5-HT) concentration did not significantly differ between control subjects (N = 45) and schizophrenic (N = 62) or chronic schizophrenic (N = 39) patients. No clinical feature was associated with hyperserotonemia, but the subgroup receiving benzodiazepines had a significantly higher 5-HT level than other patients.