Browse Medical Laboratory Calculators
Thyroglobulin (Tg) Unit Converter
Thyroglobulin (Tg) is a large glycoprotein produced by the thyroid follicular cells. It is the precursor protein for thyroid hormone synthesis.
Clinically, serum Thyroglobulin is the primary tumor marker for monitoring patients with **Differentiated Thyroid Cancer** (Papillary and Follicular) after total thyroidectomy and radioiodine ablation. This converter facilitates switching between standard mass units (ng/mL, μg/L) and SI molar units (pmol/L).
Mass Units
StandardNanograms per milliliter (Numerically equivalent to μg/L).
SI / Molar Units
Picomoles per liter (Research use).
Clinical Context
Post-Thyroidectomy Target:
• Excellent Response: Tg < 0.2 ng/mL (suppressed) or < 1.0 ng/mL (stimulated).
• Recurrence: Rising Tg levels over time are highly suspicious for recurrence in athyreotic patients.
Note: Always measure **Anti-Thyroglobulin Antibodies (TgAb)** concurrently. Presence of TgAb interferes with Tg immunoassays, often causing falsely low results.
Conversion Logic:
Molecular Weight of Thyroglobulin: ~660,000 Da (660 kDa).
1 ng/mL ≈ 1.52 pmol/L.
1 pmol/L ≈ 0.66 ng/mL.
Clinical References
How to Use This Converter
Follow these steps to normalize Thyroglobulin values.
Enter Values
Input your laboratory result into the corresponding unit field (e.g., ng/mL).
Automatic Conversion
The calculator converts between mass units and the SI molar unit using the molecular weight of 660 kDa.
Reset
Use the Clear button to reset all fields.
Frequently Asked Questions
Yes. 1 nanogram per milliliter is numerically identical to 1 microgram per liter.
Antibodies bind to Tg, interfering with the assay. If antibodies are present, the Tg result may be unreliable (usually falsely low).