Abstract

Intercorrelations among homovanillic acid (HVA), 5-hydroxyindoleacetic acid (5-HIAA), and 3-methoxy-hydroxy-phenylglycol (MHPG) concentrations in lumbar cerebrospinal fluid (CSF) were examined before and after blockade of the acid transport system by probenecid in 59 psychiatric inpatients. The three compounds remained intercorrelated despite acid transport blockade, suggesting that the common transport system does not account for their covariance. Other possibilities to explain the interrelationship among these compounds are discussed.

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