A positive diagnosis or strong clinical indicator for Hashimoto's thyroiditis is typically triggered when Thyroid Peroxidase (TPO) antibody levels exceed the standard laboratory reference threshold, which is usually anything higher than 34 to 35 International Units per milliliter, though exact cutoffs vary slightly depending on the testing laboratory. While borderline elevations between 35 and 100 IU/mL suggest mild or early autoimmune activity, significantly higher readings surpassing 100 IU/mL or soaring into the thousands strongly point toward active Hashimoto's disease. Physicians evaluate these specific antibody titers alongside your TSH and free hormone levels to confirm a diagnosis.
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