Control of exogenous factors affecting plasma homovanillic acid concentration.

@article{Davidson1987ControlOE,
  title={Control of exogenous factors affecting plasma homovanillic acid concentration.},
  author={Michael Davidson and Anne B. Giordani and Richard C. Mohs and Victoria Mykytyn and Steve Platt and Z S Aryan and Kenneth L. Davis},
  journal={Psychiatry research},
  year={1987},
  volume={20 4},
  pages={
          307-12
        }
}
Measurements of plasma homovanillic acid (pHVA) concentrations appear to be a valid research strategy in psychiatric disorders in which a central dopamine (DA) abnormality has been implicated. This study provides guidance about the control of some of the exogenous factors affecting pHVA concentrations. Fasting for 14 hours eliminates the dietary effects on pHVA in healthy human subjects. Changing position, walking for 30 minutes, or smoking two cigarettes has no effect on pHVA concentrations. 

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