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Tg Antibodies (TgAb): Approximately 15 to 20 percent of thyroid cancer patients have antibodies to Tg that circulate in their blood. These antibodies are abbreviated as TgAb on laboratory reports. Unfortunately, TgAb interferes with the measurement of Tg by most methods.hen a patient has TgAb detected, it is not unusual to see a temporary rise in the TgAb level during the first six months following radioiodine therapy. This may even be a sign of the effectiveness of the treatment. Usually, TgAb values return to the original value or below after six months.
Thyroglobulin (Tg) levels are low or undetectable with normal thyroid function but can by elevated in thyroiditis, Gravesâ disease, or thyroid cancer. Monitoring of Tg levels is frequently used to evaluate the effectiveness of treatment for thyroid cancer and to monitor for thyroid cancer recurrence.