This assay employs the competitive inhibition enzyme immunoassay technique. The microtiter plate provided in this kit has been pre-coated with goat-anti-rabbit antibody. Standards or samples are added to the appropriate microtiter plate wells with an antibody specific for dopamine and Horseradish Peroxidase (HRP) conjugated dopamine. The competitive inhibition reaction is launched between with HRP labeled dopamine and unlabeled dopamine with the antibody. A substrate solution is added to the wel