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Thyroglobulin

Published: July 27, 2026Updated: August 25, 2026

Thyroglobulin is a protein produced by the thyroid gland and is used to monitor thyroid cancer treatment and recurrence.

Quick summary

Thyroglobulin is a key biomarker for tracking thyroid cancer treatment and potential relapse.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
ng/mL
Clinical utility
monitoring
Result kind
quantitative
FDA-cleared
Roche Thyroglobulin, Abbott Thyroglobulin, Siemens Thyroglobulin
interpretation: {"text":"Indicates successful treatment and absence of residual thyroid tissue or cancer.","label":"Low/undetectable"}; {"text":"May suggest residual or recurrent thyroid cancer, requiring further evaluation.","label":"High"}

Thyroglobulin (Tg) is a protein synthesized by the follicular cells of the thyroid gland and is essential for the production of thyroid hormones. Its levels in the blood can indicate the presence of thyroid tissue.

In patients who have undergone treatment for thyroid cancer, thyroglobulin levels are monitored to detect any residual or recurrent disease. Low or undetectable levels are expected after successful treatment.

Elevated thyroglobulin levels may suggest the presence of thyroid cancer cells, prompting further investigation and potential adjustment of treatment strategies.

Frequently asked questions

What is the normal range for thyroglobulin?
The normal range for thyroglobulin is typically 1.4–29 ng/mL, but this can vary depending on the laboratory and the patient's history.
How often should thyroglobulin levels be checked?
Thyroglobulin levels are usually monitored every 6 to 12 months after thyroid cancer treatment, but the frequency may vary based on individual patient needs.
  1. 1
    American Thyroid AssociationSource
  2. 2
    Mayo ClinicSource

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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy