Patients with autoimmune thyroid disease (ATD), including Hashimoto's thyroiditis and Grave's disease, occasionally develop autoantibodies to T4 and T3. These autoantibodies interfere with the measurment of T4 and T3 by immunoassay. Thus, abnormal or disparate T4 concentrations may be due to autoantibodies.
Red TOP tube.
Reported (Analytical Time)
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