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Tagged with thyroperoxidase-tpo test-results
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TPO (Thyroid Peroxidase) Antibodies - reference range change
A couple years ago (end of 2013) the reference range for TPO antibodies (TPOAb) was <35 IU/ml but now it's <9 IU/ml. That's a huge change (almost 4x). Does anyone know why it changed by so ...
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