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Antithyroid Antibody

Reference Range

Antithyroid antibody studies are used to evaluate for autoimmune thyroid problems.

The reference ranges for antithyroid antibodies are as follows:

Thyroid peroxidase antibody (TPOAb): Less than 35 IU/mL

Thyroglobulin antibody (TgAb): Less than 20 IU/mL

Thyroid-stimulating immunoglobulin antibody (TSI): Less than 140% of basal activity

Thyroid-stimulating hormone (TSH) receptor binding inhibitor immunoglobulin (TBII)/TRAb: 1.75 IU/L or less

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