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Thyroglobulin

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

Thyroglobulin is a protein produced by the thyroid gland and is used as a biomarker to monitor thyroid cancer and assess thyroid function.

Quick summary

Thyroglobulin is a key biomarker for monitoring thyroid cancer and evaluating thyroid function.

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

Key facts at a glance

Units
IU/L
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche TRAb, Abbott TRAb, Siemens TRAb, MediGnost TRAb
interpretation: {"text":"0–1.75 IU/L: Thyroglobulin levels within this range are generally considered normal and indicate no immediate concerns regarding thyroid cancer or dysfunction.","label":"Normal"}; {"text":">1.75 IU/L: Elevated levels may indicate the presence of thyroid cancer, especially in post-thyroidectomy patients, or other thyroid disorders such as goiter or thyroiditis.","label":"Elevated"}

Thyroglobulin (Tg) is a protein synthesized exclusively by thyroid follicular cells, making it a specific marker for thyroid tissue. Its levels can be indicative of the presence and activity of healthy thyroid tissue as well as thyroid cancer.

In the context of thyroid cancer, particularly differentiated thyroid cancer, thyroglobulin levels are monitored post-thyroidectomy to detect residual or recurrent disease. Elevated levels may suggest cancer recurrence.

Additionally, thyroglobulin is used in conjunction with thyroid-stimulating hormone (TSH) and anti-thyroglobulin antibodies to provide a comprehensive evaluation of thyroid function and disease status.

Frequently asked questions

What does a high thyroglobulin level mean?
A high thyroglobulin level may indicate the presence of thyroid cancer, particularly in patients who have undergone thyroidectomy, or other thyroid disorders like goiter or thyroiditis.
How is thyroglobulin testing used in thyroid cancer monitoring?
Thyroglobulin testing is used to monitor patients after thyroidectomy for differentiated thyroid cancer. Rising levels may suggest cancer recurrence or residual disease.
  1. 1
    American Thyroid Association: ThyroglobulinSource
  2. 2
    Mayo Clinic: Thyroglobulin TestSource

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

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

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