Thyroglobulin (Tg)

This is a test used to monitor treatment of some types of thyroid cancer and to detect recurrence. Less commonly, may be used to help determine the cause of hyperthyroidism. It is used once treatment for thyroid cancer has been completed, before and after radioactive iodine therapy, and at regular intervals to monitor for recurrence.

PREPARATION FOR TEST

A blood sample is obtained by inserting a needle into a vein in the arm.

NORMAL FINDINGS

  • Age: 0-11 months

  • Male: 0.6-5.5 ng/mL

  • Female: 0.5-5.5 ng/mL

  • Age: 1-11 years

  • Male: 0.6-50.1 ng/mL

  • Female: 0.5-52.1 ng/mL

  • Age: 12 years and older

  • Male: 0.5-53.0 ng/mL

  • Female: 0.5-43.0 ng/mL

Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your doctor after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.

MEANING OF TEST

Your caregiver will go over the test results with you and discuss the importance and meaning of your results, as well as treatment options and the need for additional tests if necessary.

OBTAINING THE TEST RESULTS

It is your responsibility to obtain your test results. Ask the lab or department performing the test when and how you will get your results.