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What is a THYROGLOBULIN (Tg)?

The Thyroglobulin (Tg) test is a blood test that measures the level of thyroglobulin, a protein produced by the thyroid gland. It is not typically used to diagnose thyroid disorders but is mainly performed to monitor patients with thyroid cancer after treatment, especially following thyroid surgery or radioactive iodine therapy. Elevated levels may indicate residual thyroid tissue or recurrence of cancer. Doctors recommend this test to track treatment effectiveness and detect early signs of disease recurrence, ensuring timely medical intervention.

Additional Information

Also known as/ Other names: Serum Thyroglobulin Test, Tg Test, Thyroglobulin Tumor Marker, Thyroglobulin Assay
Parameters: 1
Recommended for: M/F/Others
Sample Type: Blood
Patient Preparation: No prior preparation is needed
Reports: Next Day

FAQs

Is Tg used to diagnose thyroid cancer?

No, it’s not a diagnostic test but a monitoring tool after thyroid cancer treatment.

What does a high Tg level mean?

Elevated Tg may indicate remaining thyroid tissue, incomplete removal, or recurrence of thyroid cancer.

What does a low Tg level mean?

Low or undetectable Tg usually suggests successful treatment and absence of thyroid tissue or cancer.

Can Tg levels be affected by antibodies?

Yes, anti-thyroglobulin antibodies can interfere with results, so antibody testing is often done alongside Tg.

Is Tg test useful after thyroid surgery?

Yes, it helps monitor whether all thyroid tissue was removed and checks for recurrence.

Can Tg test be used in healthy individuals?

No, it’s specifically used for thyroid cancer monitoring, not routine health screening.

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