Carbohydrate Deficient Transferrin (CDT) Test
The Carbohydrate Deficient Transferrin (CDT) blood test provided by Orbit Labs looks at transferrin, a protein that transports iron around the body, which is affected by excessive alcohol consumption. The effect is a change in the number of carbohydrate molecules within the protein. The level of deficiency is reported as a percentage (%). A positive reading above the reference range would be consistent with an increased alcohol intake of longer than 2 to 4 weeks.