“…Most of the investigations that studied the relationship between ceruloplasmin and schizophrenia have found elevated levels of ceruloplasmin in schizophrenic patients, although decreased levels or normal levels have also been found (181)(182)(183)(184). In a recent study, Ceruloplasmin, C 3 and C 4 blood levels were found as useful peripheral biological markers of negative acute paranoid schizophrenic symptoms (185).…”