Thyroglobulin Test

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Formal name: Thyroglobulin (Tg)
Related tests: Thyroglobulin antibody; Tumour markers; TSH; Thyroxine (T4)

At a Glance

Why Get Tested?

To monitor treatment of some types of thyroid cancer and to look for return of the cancer

When to Get Tested?

Once treatment for thyroid cancer has been completed, before and after radioactive iodine therapy for thyroid cancer, and at varying intervals to monitor for recurrence.

Sample Required?

A blood sample taken from a vein in your arm

Test Preparation Needed?

No fasting or special preparation is required before the test. In order to increase the ability of the test to pick up very small amounts of remaining thyroid cells some patients may be asked to stop taking their thyroid hormone replacement tablets prior to the test or be given injections (recombinant TSH) in an attempt to stimulate thyroglobulin production. Please follow any instructions you are given by your Doctor, prior to having this blood test.