How is the evaluation of hypothyroid?

Directed toward confirming dx and identifying cause of hormone deficiency (hx of meds/radiation, PE of goiter/thyroidectomy scar) Pt w/ overt primary hypothyroid almost all have chronic autoimmune thyroiditis so we don't always need to get serum autoantibodies antithyroid. Anti-TPO may be useful however to see progression from subclinical to overt