Thyroid Function Tests

Primary, subclinical or central

Primary, subclinical or central

Thyroid response to acute or chronic illness

First line test for thyroid dysfunction

Measure of non-protein bound thyroxine

Rarely used in diagnosis of thyroid disease

Rarely measured in clinical practice

Present in Hashimoto's, though rarely required for diagnosis

Present in Hashimoto's, though rarely required for diagnosis

Pathognomonic of Grave's, though not always required for diagnosis