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MedicalVideos.com — Lab Values
Thyroid Tests reference sheet. Typical adult ranges; ranges vary by laboratory — always compare a result with the range on the patient’s own report.
Thyroid Tests reference sheet. Typical adult ranges; ranges vary by laboratory — always compare a result with the range on the patient’s own report.
Thyroid Tests — Reference Ranges
The thyroid gland sets the body’s metabolic pace through its hormones, T4 and T3, which are controlled in turn by TSH from the pituitary gland. Thyroid tests are usually read as a pattern — TSH together with free T4 — rather than as single numbers.
This page lists all 10 tests in this group with their typical adult ranges in both unit systems. Open any test for plain-language notes on high and low results and how to prepare.
| Test | Abbr. | Typical range (conventional) | Typical range (SI) |
|---|---|---|---|
| Free Thyroxine | Free T4 | 0.8–1.8 ng/dL | 10–23 pmol/L |
| Free Triiodothyronine | Free T3 | 2.3–4.2 pg/mL | 3.5–6.5 pmol/L |
| Reverse T3 | rT3 | 10–24 ng/dL | 0.15–0.37 nmol/L |
| Thyroglobulin | Tg | 1.5–38.5 ng/mL | 1.5–38.5 ng/mL |
| Thyroglobulin Antibodies | Anti-Tg | <20 IU/mL | <20 IU/mL |
| Thyroid Peroxidase Antibodies | Anti-TPO | <35 IU/mL | <35 IU/mL |
| Thyroid-Stimulating Hormone | TSH | 0.4–4.5 mIU/L | 0.4–4.5 mIU/L |
| Thyroid-Stimulating Immunoglobulin | TSI | <140 % of baseline | <140 % of baseline |
| Total Thyroxine | Total T4 | 5.0–12.0 µg/dL | 64–154 nmol/L |
| Total Triiodothyronine | Total T3 | 80–200 ng/dL | 1.2–3.1 nmol/L |
Full, always-updated version of this sheet: https://www.medicalvideos.com/lab-values/panel/thyroid/Printed from MedicalVideos.com Lab Values. Educational reference only — not medical advice.
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.