high thyroid peroxidase levelelevated thyroid peroxidase antibodynormal thyroid peroxidase levelsthyroid peroxidase antibody rangethyroid peroxidase antibody testelevated thyroid peroxidasethyroid peroxidase functionthyroid peroxidase rangethyroid antibody testthyroid peroxidase testthyroid microsomal antibody rangethyroid antibody normal range