2011
DOI: 10.2147/ijnrd.s22783
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Validity of urinary monoamine assay sales under the “spot baseline urinary neurotransmitter testing marketing model”

Abstract: Spot baseline urinary monoamine assays have been used in medicine for over 50 years as a screening test for monoamine-secreting tumors, such as pheochromocytoma and carcinoid syndrome. In these disease states, when the result of a spot baseline monoamine assay is above the specific value set by the laboratory, it is an indication to obtain a 24-hour urine sample to make a definitive diagnosis. There are no defined applications where spot baseline urinary monoamine assays can be used to diagnose disease or othe… Show more

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Cited by 11 publications
(45 citation statements)
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“…This did not work because it did not take into account the effects of transporters. This high/low approach to assay interpretation, as a guide to amino acid dosing values, was no more effective than simply giving amino acid precursors randomly 5,7,11…”
Section: Organic Cation Transportersmentioning
confidence: 99%
“…This did not work because it did not take into account the effects of transporters. This high/low approach to assay interpretation, as a guide to amino acid dosing values, was no more effective than simply giving amino acid precursors randomly 5,7,11…”
Section: Organic Cation Transportersmentioning
confidence: 99%
“…Proper OCT assay requires that initially the serotonin and dopamine systems are placed in the competitive inhibition state simultaneously, while administering adequate amounts of serotonin and dopamine amino acid precursors. The assay results are then compared in order to determine the change in urinary serotonin and dopamine concentrations associated with changes in amino acid precursor dosing values 2,3,5,6,11…”
Section: Methodsmentioning
confidence: 99%
“…Previously published literature by the authors provides proof that in the endogenous state transporter-dependent monoamine concentrations are indistinguishable in subjects with and without monoamine-related disease and/or regulatory dysfunction. These findings are an integral part of the challenge to the validity of the monoamine hypothesis 4,6,10…”
Section: Introductionmentioning
confidence: 96%
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“…L-3,4-dihydroxyphenylalanine (L-dopa) is a metabolite of L-tyrosine and the immediate precursor of dopamine. Dopamine does not cross the blood–brain barrier 1. L-dopa freely crosses the blood–brain barrier, then is synthesized into dopamine without biochemical feedback inhibition 2.…”
Section: Introductionmentioning
confidence: 99%