Mild increase in subclinical hypothyroidism, which is defined as a mild increase in serum TSH and normal free thyroxine and triiodothyronine levels
Hashimoto's thyroiditis patients who are euthyroid
Ectopic TSH secretion in certain cancers (lung, breast).
Recovery phase of subacute thyroiditis
Recovery phase of a non-thyroidal illness
Thyroid hormone resistance
Decreased in:
Primary Hyperthyroidism
Secondary (pituitary) hypothyroidism
Tertiary hypothyroidism
Graves disease
Thyroiditis
Toxic adenomas
Acute medical or surgical illness
Some drugs such as dopamine
High-dose corticosteroids
Mild decrease in subclinical hyperthyroidism (mild decrease in serum TSH and normal free thyroxine and triiodothyronine levels, as in treated Graves disease, toxic multinodular goiter, autonomous thyroid hormone secretion, exogenous thyroid hormone therapy)