Triiodothyronine, Total and Free
is a topic covered in the Davis's Lab & Diagnostic Tests
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T3 and FT3.
To assist in evaluating thyroid function primarily related to diagnosing hyperthyroidism and monitoring the effectiveness of therapeutic interventions.
There are no food, fluid, activity, or medication restrictions unless by medical direction.
|Age||Conventional Units||SI Units (Conventional Units × 0.0154)|
|Cord blood||14–86 ng/dL||0.22–1.32 nmol/L|
|1–3 days||100–292 ng/dL||1.54–4.5 nmol/L|
|4–30 days||62–243 ng/dL||0.96–3.74 nmol/L|
|1–12 mo||105–245 ng/dL||1.62–3.77 nmol/L|
|1–5 yr||105–269 ng/dL||1.62–4.14 nmol/L|
|6–10 yr||94–241 ng/dL||1.45–3.71 nmol/L|
|16–20 yr||80–210 ng/dL||1.23–3.23 nmol/L|
|Adult||70–204 ng/dL||1.08–3.14 nmol/L|
|Older adult||40–181 ng/dL||0.62–2.79 nmol/L|
|Pregnant woman (last 4 mo gestation)||116–247 ng/dL||1.79–3.8 nmol/L|
|Age||Conventional Units||SI Units (Conventional Units × 1.54)|
|0–3 days||2–7.9 pg/mL||3.1–12.2 pmol/L|
|4–30 days||2–5.2 pg/mL||3.1–8 pmol/L|
|1–23 mo||1.6–6.4 pg/mL||2.5–9.9 pmol/L|
|2–6 yr||2–6 pg/mL||3.1–9.2 pmol/L|
|7–17 yr||2.9–5.1 pg/mL||4.5–7.8 pmol/L|
|Adults and older adults||2.6–4.8 pg/mL||4–7.4 pmol/L|
|Pregnant women (4–9 mo gestation)||2–3.4 pg/mL||3.1–5.2 pmol/L|
Critical Findings and Potential Interventions
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Bladh, Mickey Lynn., and Anne M. Van Leeuwen. "Triiodothyronine, Total and 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/425347/all/Triiodothyronine__Total_and_Free.
Bladh ML, Van Leeuwen AM. Triiodothyronine, Total and Free. Davis's Lab & Diagnostic Tests. 7th ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425347/all/Triiodothyronine__Total_and_Free. Accessed July 17, 2019.
Bladh, M. L., & Van Leeuwen, A. M. (2017). Triiodothyronine, Total and Free. In Davis's Lab & Diagnostic Tests. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425347/all/Triiodothyronine__Total_and_Free
Bladh ML, Van Leeuwen AM. Triiodothyronine, Total and Free [Internet]. In: Davis's Lab & Diagnostic Tests. F.A. Davis Company; 2017. [cited 2019 July 17]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425347/all/Triiodothyronine__Total_and_Free.
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