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Antithyroid microsomal antibody is a test to measure antithyroid microsomal antibodies in the blood. Microsomes are found inside thyroid cells. The body produces antibodies to microsomes when there has been damage to thyroid cells. A blood sample is needed.
Thyroid peroxidase (microsomal antigen): Antithyroid peroxidase antibody (TPOAb). TSH receptor: Anti-TSH receptor antibody (TRAb). The presence of serum thyroid antibodies usually indicates an autoimmune thyroid disorder, but elevated levels may also be detected in other conditions.elatives of patients with an autoimmune thyroid disorder (40%-50%) may have elevated serum TgAb levels. Assays for TgAb and TPOAb are highly sensitive but less specific; therefore, the absolute concentration is very important in the interpretation of the test.