http://www.nlm.nih.gov/medlineplus/ency/article/003561.htm
Were these tests done for your dysautonomia/POTS? If so, did your doctor draw blood and test these levels during a tilt? That can be very informative. If it helps at all, my levels were, pre-tilt: Dopamine - less than 20, Epinephrine - 25, Norepinephrine - 316; during tilt: Dopamine - less than 20, Epinephrine - less than 10, Norepinephrine - 258.