Anti Thyroglobulin Antibody (Atg)

You should get an anti-thyroglobulin antibody test if you have abnormal thyroid function tests, a goiter, or symptoms of hypothyroidism or hyperthyroidism, especially when anti-TPO is negative. It is essential after thyroid cancer surgery, along with thyroglobulin, to monitor for recurrence, and is recommended during pregnancy with thyroid problems.

No special preparation or fasting is required for an anti-thyroglobulin antibody test. Stop biotin supplements 48–72 hours beforehand, as biotin may interfere with results. Inform your doctor about any thyroid medicines, recent thyroid surgery, or radioactive iodine treatment. For cancer follow-up, use the same lab each time for consistent comparison.

No, fasting is not required for an anti-thyroglobulin antibody test. You can eat and drink normally before giving your sample, and the test can be done at any time of day. However, stop biotin supplements 48–72 hours beforehand, as biotin may interfere with the results.