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  • Title: Urinary phenylacetic acid excretion in depressive patients.
    Author: González-Sastre F, Mora J, Guillamat R, Queraltó JM, Alvarez E, Udina C, Massana J.
    Journal: Acta Psychiatr Scand; 1988 Aug; 78(2):208-10. PubMed ID: 3223321.
    Abstract:
    Phenylacetic acid (PAA), a metabolite of phenylethylamine, has been found in the urine of depressed patients at lower levels than in control subjects. It has been suggested that the determination of PAA in urine could be used as a biological marker of the depressive condition. In this study the levels of PAA in urine were investigated by gas-liquid chromatography in 39 patients diagnosed as having major depression according to DSM-III criteria, and in 32 healthy subjects. The values found in the patients were markedly lower than in controls. No relationship was found between the decrease of PAA excretion and weight loss. Using a discriminant equation, a value of 69% was obtained for both sensitivity and specificity. The results suggest that the determination of urine PAA could be a biological parameter comparable to the dexamethasone suppression test.
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