This test measures four critical areas of metabolism: gastrointestinal function and dysbiosis markers, cellular and mitochondrial energy metabolites, neurotransmitter metabolites, and functionally important organic acid metabolites of amino acids. The reference ranges for this test apply to children (2-12 yrs) and adults. Includes 38 organic acids ratioed to creatinine, including 8 gastrointestinal metabolites,13 cellular energy metabolites, 4 neurotransmitter metabolites, and 14 amino acid metabolites.