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Which one of these interferes with plasma and urine catecholamines assay?— Kenar Jhaveri (@kdjhaveri) August 26, 2018
The answer is all of the above. There are several agents that interfere the workup for pheochromocytoma and can interfere with the catecholamine and dopamine pathway. The comprehensive list is listed below.
Tricyclic antidepressants, phenoxybenzamine, labetelol can affect the measurement of both catecholamines and metanpehrines
Monoamine oxidase inhibitors and buspirone affects mainly the metanephrine measurements
Caffeine, L-Dopa, Carbidopa mainly affect the catecholamine assays
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