This blood test profile includes tests for the trace elements copper and plasma zinc along with three important vitamins – folate, active B12, D – and a test for iron store levels and inflammation, ferritin. This is a set of tests often ordered by nutritional specialists to check the status of those following the Walsh Protocol – which is based on the hypothesis that imbalances in certain key nutrients can result in biochemical disturbance within the brain, and subsequent mental health disorders.