Free T4, FT4.
A complementary laboratory test in evaluating thyroid hormones levels related to deficiency or excess to assist in diagnosing hyperthyroidism and hypothyroidism.
Serum (1 mL) collected in a red- or tiger-top tube. Plasma (1 mL) 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 (1st trimester)||0.9–1.4 ng/dL||12–18 pmol/L|
|Pregnancy (2nd trimester)||0.7–1.3 ng/dL||9–17 pmol/L|
Thyroxine, Free has been found in Davis's Lab & Diagnostic Tests
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