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Plasma and cerebrospinal fluid (CSF) levels of the major dopamine metabolite homovanillic acid (HVA) were measured in psychiatric patients after an average washout period of 19 days, and again after 4 weeks of pharmacological treatment. Absolute values of plasma HVA did not correlate with absolute values of CSF HVA either at baseline or after treatment. However, changes in plasma HVA were highly correlated with changes in CSF HVA. Further, while baseline levels of plasma and CSF HVA were not significantly correlated with baseline clinical measures, clinical improvement was associated with decreases in both plasma and CSF HVA. This reached statistical significance for the plasma HVA level/clinical response relationship.
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