Davis's Lab & Diagnostic Tests
Triiodothyronine, Total and Free
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Synonym/Acronym:
T3 and FT3.
Rationale
To assist in evaluating thyroid function primarily related to diagnosing hyperthyroidism and monitoring the effectiveness of therapeutic interventions.
Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Normal Findings
Method: Electrochemiluminescent Immunoassay.
| T3 | ||
|---|---|---|
| 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 |
| FT3 | ||
|---|---|---|
| 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 | 2.4–4.2 pg/mL | 3.7–6.5 pmol/L |
| Pregnant women (4–9 mo gestation) | 2–3.4 pg/mL | 3.1–5.2 pmol/L |
Critical Findings and Potential Interventions
N/A
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Synonym/Acronym:
T3 and FT3.
Rationale
To assist in evaluating thyroid function primarily related to diagnosing hyperthyroidism and monitoring the effectiveness of therapeutic interventions.
Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Normal Findings
Method: Electrochemiluminescent Immunoassay.
| T3 | ||
|---|---|---|
| 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 |
| FT3 | ||
|---|---|---|
| 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 | 2.4–4.2 pg/mL | 3.7–6.5 pmol/L |
| Pregnant women (4–9 mo gestation) | 2–3.4 pg/mL | 3.1–5.2 pmol/L |
Critical Findings and Potential Interventions
N/A
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