Organic Acid testing may be helpful for a wide range of health concern, including mental symptoms such as depression and anxiety. Organic acids are by-products of cellular metabolic activity. These can give insight into many different factors, such a vitamin status, toxicity and ability to produce energy at the cellular level. Neurotransmitters are just a small part of what can be learned through organic acid tests. Although such testing can be useful in some cases, please keep i mind that the factors that lead to mental symptoms, are complex and multifactorial. The first is a comprehensive history and testing (if any) should be based up the history. One treats the person, not the lab test. Serotonin, dopamine, and epinephrine pathways are just one consideration. http://drsaulmarcus.com More information on natural health for depression and anxiety: http://drsaulmarcus.com/mentalillness...