General
Synonym/Acronym:
Free T3, FT3.
Common Use:
A complementary adjunct to evaluate thyroid hormone levels primarily related to hyperthyroidism and to assess causes of hypothyroidism.
Specimen:
Serum (1 mL) collected in a red- or tiger-top tube.
Normal Findings:
(Method: Immunoassay)
| Age | Conventional Units | SI Units (Conventional Units × 0.0154) |
|---|
| 0–3 days | 2–7.9 pg/mL | 0.03–0.12 pmol/L |
| 4–30 days | 2–5.2 pg/mL | 0.03–0.08 pmol/L |
| 1–23 mo | 1.6–6.4 pg/mL | 0.02–0.1 pmol/L |
| 2–6 yr | 2–6 pg/mL | 0.03–0.09 pmol/L |
| 7–17 yr | 2.9–5.1 pg/mL | 0.04–0.08 pmol/L |
| Adults and older adults | 2.6–4.8 pg/mL | 0.04–0.07 pmol/L |
| Pregnant women (4–9 mo gestation) | 2–3.4 pg/mL | 0.03–0.05 pmol/L |
Triiodothyronine, Free has been found in Davis's Lab & Diagnostic Tests
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