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In a series of articles, Trygstad et al. (1980) suggested that specific patterns of peptide excretion and increased levels of peptide material are found by chromatographic analysis of the urine of patients with a variety of psychiatric illness including schizophrenia. As these results have not been independently replicated in another laboratory, we conducted an investigation of urine samples from 5 DSM-III classified schizophrenic patients and 4 normal subjects using the techniques described by the Norwegian group, and with a series of modifications. The chromatographic profiles obtained differ widely from those reported by Trygstad et al. No significant differences were detected between patients with schizophrenia and controls. The methods used by Trygstad et al. are complex and we have defined several parts of the methods which are subject to variability. Our findings lend no support to the view that patients with psychiatric illness can be readily distinguished from normal subjects by the amount or profile of peptide excretion in urine.
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Received in revised form: April 6, 1989
Received: June 8, 1987
© 1990 Published by Elsevier Inc.