Normal dopamine levels are contingent on age and method of testing. With urine testing, individuals 17 and younger should have 51 to 645 micrograms of dopamine every 24 hours. For adults, 52 to 480 micrograms is normal, according to Medscape.
Normal dopamine figures can vary slightly across age groups. Dopamine levels can be measured with urine or plasma testing. With plasma testing, adults should have 10 to 20 nanograms of dopamine at any given time, depending on their activity level. Children ages 17 and younger should have less than 60 picograms. Dopamine levels may be elevated following serious illness, during medication withdrawal or while taking medications such as antidepressants, reports Medscape.