A study on serum prolactin levels in schizophrenia: correlation with positive and negative symptoms.

Serum prolactin levels are determined in 116 schizophrenics and 120 control subjects. Values of prolactin levels of the patients are compared with the values of control of the same sex and age group. There is no significant difference between prolactin levels of controls and those with negative or positive symptoms of schizophrenia. Analysis, taking age into account, also does not show any significant difference between patients with positive or negative symptoms and controls. The relationship between nature of symptoms of schizophrenia and serum prolactin levels varies in different studies. The possible reasons for such variations are discussed.