Thyroid Function Tests
Synthesis of Thyroid Hormones
Laboratory Thyroid Profile
T4 (Total)
Relationship of Thyroid-binding globulin (TBG) to total serum T4 concentration
Causes for Increased Thyroxine-Binding Globulin
Causes for Decreased Thyroxine-Binding Globulin
RTU,TBR
FT4 - I
Causes for Decreased Thyroxine or Free Thyroxine Values
Causes for Increased Thyroxine or Free Thyroxine Values (cont.)
TSH
Conditions That Increase Serum Thyroid-Stimulating Hormone Values
Conditions That Increase Serum Thyroid-Stimulating Hormone Values (cont.)
Conditions That Decrease Serum Thyroid-Stimulating Hormone Values*
Conditions That Decrease Serum Thyroid-Stimulating Hormone Values* (cont)
131I Uptake
Etiologies of Decreased Radioactive Iodine Uptake Values
Some Nonthyroid Illnesses that Can Affect Thyroid Tests
Thyroiditis - inflammation of the thyroid gland
Acute Bacterial Thyroiditis
De Quervainís Thyroiditis - Subacute Granulomatous Thyroiditis
PPT Slide
Subacute Painless Thyroiditis (Silent)
Riedelís Thyroiditis
Hashimotoís Thyroiditis
Graveís Disease
Hypothyroidism
Goiter
Non-toxic Goiter
Table I: Summary of Thyroid Profile and 131I Uptake Results in Disorders Associated with Thyrotoxicosis, Hypothyroidism and Alterations in Thyroid-binding Globulin*
Email: ross.klingsberg@tulane.edu
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