Patent ID: 8362416

Claim:
A method for determining in a urine sample the amount of one or more analytes selected from the group consisting of epinephrine, norepinephrine, and dopamine, the method comprising: a. subjecting the sample to electrospray ionization (ESI) under conditions suitable to produce one or more ions detectable by mass spectrometry; wherein: i. if one of the one or more analytes is epinephrine, said ionization comprises generating ions with a mass to charge ratio of 166.1±0.50; ii. if one of the one or more analytes is norepinephrine, said ionization comprises generating ions with a mass to charge ratio of 151.9±0.50; and iii. if one of said one or more analytes is dopamine, said ionization comprises generating ions with a mass to charge ratio of 136.9±0.50; b. determining the amount of the one or more ions by mass spectrometry; and c. using the amount of the one or more ions to determine the amount of said one or more analytes in the sample.