Table 1.

Thyroid Function Test Interpretation (11).

TSH	Free T4	Free T3	Condition
Normal	Normal	Normal	Normal
Low	High	High	Primary hyperthyroidism
Low	Normal	Normal	Subclinical hyperthyroidism
Low	Normal	High	T3 toxicosis
Low	High	Normal	Thyroiditis
Low	Low	Low	Euthyroid or central hypothyroidism
High	Normal	Normal	Subclinical hypothyroidism
High	Low	Low	Primary hypothyroidism
High	High	High	TSH-producing pituitary adenoma

TSH = thyroid-stimulating hormone.