A measure of the total amount of folate in the serum. Folate is needed to make red and white blood cells in the bone marrow, convert carbohydrates into energy, and produce DNA and RNA. Adequate intake is extremely important during periods of rapid growth such as pregnancy, infancy, and adolescence. Levels may indicate dietary insufficiency, malabsorption or anaemia, methylation status, anaemia. Consider links to biopterin pathways and links to neurotransmitters like dopamine and serotonin etc.