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Free T4, Free4.
A reflex test for thyroid function to assist in diagnosing hyperthyroidism and hypothyroidism in the presence of an abnormal TSH level.
Serum collected in a gold-, red-, or red/gray-top tube. Plasma collected in a green-top (heparin) tube is also acceptable.
|Age||Conventional Units||SI Units (Conventional Units × 12.9)|
|Newborn||0.8–2.8 ng/dL||10–36 pmol/L|
|1–12 mo||0.8–2 ng/dL||10–26 pmol/L|
|1–18 yr||0.8–1.7 ng/dL||10–22 pmol/L|
|Adult–older adult||0.8–1.5 ng/dL||10–19 pmol/L|
|Pregnancy||0.7–1.4 ng/dL||9–18 pmol/L|
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Bladh, Mickey Lynn., and Anne M. Van Leeuwen. "Thyroxine, Free." Davis's Lab & Diagnostic Tests, 7th ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425190/all/Thyroxine__Free.
Bladh ML, Van Leeuwen AM. Thyroxine, Free. Davis's Lab & Diagnostic Tests. 7th ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425190/all/Thyroxine__Free. Accessed April 25, 2019.
Bladh, M. L., & Van Leeuwen, A. M. (2017). Thyroxine, Free. In Davis's Lab & Diagnostic Tests. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425190/all/Thyroxine__Free
Bladh ML, Van Leeuwen AM. Thyroxine, Free [Internet]. In: Davis's Lab & Diagnostic Tests. F.A. Davis Company; 2017. [cited 2019 April 25]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425190/all/Thyroxine__Free.
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