Laboratory determinations of thyroid function are useful in distinguishing patients with euthyroidism (normal thyroid gland function) from those with hyperthyroidism (increased function) or hypothyroidism (decreased function).

Subtopic(s):

• Patient Care for Thyroid Testing
• Calcitonin; Thyrocalcitonin
• Free Thyroxine (FT(4))
• Free Triiodothyronine (FT(3))
• Free Thyroxine Index (FTI); Thyroxine Binding Index (TBI)
• Neonatal Thyroid-Stimulating Hormone (TSH)
• Neonatal Thyroxine (T(4)); Neonatal Screen for Hypothyroidism
• Thyroglobulin (Tg)
• Thyroid-Stimulating Hormone (TSH; Thyrotropin)
• Thyroxine-Binding Globulin (TBG)
• Thyroxine (T(4)), Total
• Triiodothyronine (T(3)), Total
• Triiodothyronine Uptake (T(3) U)