A patient is being evaluated for thyroid dysfunction.The laboratory findings include a decreased serum free thyroxine (T₄)level and an elevated thyroid-stimulating hormone (TSH)level.These findings confirm which diagnosis?

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Hypothyroidism is indicated by a high thyroid-stimulating hormone (TSH)and low serum T₄ levels.Thyrotoxicosis is hyperthyroidism and is indicated by very low TSH,high serum T₄,and increased T₃:T₄ ratio.Addison disease is a rare disorder of the adrenal cortex that involves hyposecretion of glucocorticoids (cortisol),sometimes occurring with hyposecretion of mineralocorticoids (aldosterone).Cushing syndrome is caused by the excess release of the glucocorticoid hormone cortisol.

A Patient Is Being Evaluated for Thyroid Dysfunction