Hi, The determination of TPO antibody levels is the most sensitive test for detecting autoimmune
thyroid disease (eg, Hashimoto thyroiditis, idiopathic myxedema, and Graves disease) and detectable concentrations of anti-TPO antibodies are observed in most patients with these disorders...
Reference values of TPO is <9.0 IU/ml.
Values >9.0 IU/mL generally are associated with autoimmune thyroiditis, but elevations are also seen in other autoimmune diseases.
kindly consult physician....