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Screening test: Thyroid Stimulating Hormone (test code TSH) Screening test: Free Thyroxine (Free T4) (test code FT4) Low TSH Elevated Free T4 Increased TSH Normal Free T4 Normal Free T4 Consider ordering Free triiodothyronine (Free T3) (test code FT3). Decreased Free T4 Hypothyroidism Most common cause in the US is due to Autoimmune thyroiditis (Hashimoto’s thyroiditis, chronic thyroiditis). Elevated Free T3 Hyperthryoidism Most common cause in the US is due to Grave’s disease. Consider ordering Thyroid Stimulating Antibodies (test code TSI), if other lab or clinical findings are not characteristic. Subclinical hypothyroidism Consider ordering Thyroid Peroxidase Antibodies (test code ATPO) for prognostic evaluation of progression to hypothyroidism in Autoimmune thyroiditis.