and objectives Schizophrenia accompanies with elevated C-reactive protein (CRP) and vitamin D deficiency. However, there are scarce documentations regarding bipolar disorder and methamphetamine-induced psychotic disorder.

To compare serum levels of vitamin D, parathyroid hormone (PTH), calcium, phosphorus and CRP levels in psychotic disorder patients and control group.

A case-control study was conducted on four groups: acute phase of schizophrenia, acute manic episode of bipolar disorder, methamphetamine-induced psychotic disorder and healthy control subjects. Sample size was 45 in each group. Weekly duration of sun exposure, monthly vitamin D intake and serum levels of vitamin D, calcium, phosphorus, PTH and CRP were assessed. Brief Psychiatric Rating Scale (BPRS) was used to evaluate psychotic symptoms.

Duration of sun exposure and monthly vitamin D intake were comparable among groups. Serum levels of vitamin D, calcium and phosphorus were not statistically different between groups (P = 0.463, P = 0.086 and P = 0.339, respectively). Serum levels of PTH were significantly higher in control group (P < 0.001). CRP levels were significantly lower in control subjects (P < 0.001). The levels of serum vitamin D and CRP did not show statistically significant difference among three groups of patients.

Acute psychotic disorders seem to be associated with higher CRP and lower PTH levels. Clinical importance of the findings and relation of these differences to the metabolic and inflammatory bases of psychosis are not clear yet.

The authors have not supplied their declaration of competing interest.