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Bakground:  The goal of our study was to test the relative stability of urine, unconjugated, free catecholamines and the methyl derivatives. We measured the change in concentrations in commercially available urines after storage at various pH values, temperatures and time, from days up to 10 weeks.

A study on the stability of urinary free catecholamines and free methyl-derivatives at different pH, temperature and time of storage