What It Measures
This test measures the level of antibodies in your blood that are directed against thyroglobulin, a protein produced by the thyroid gland that serves as a precursor to thyroid hormones. The presence and quantity of these antibodies indicates whether your immune system is mistakenly attacking your own thyroid tissue.
Thyroglobulin antibodies (TgAb) are autoantibodies produced by the immune system that target thyroglobulin, a key protein made by the thyroid gland used in the production of thyroid hormones T3 and T4. Elevated TgAb levels indicate autoimmune thyroid activity and are a hallmark marker for conditions like Hashimoto's thyroiditis and Graves' disease. This test is also critical for monitoring thyroid cancer recurrence, as TgAb can interfere with thyroglobulin tumor marker measurements.
Current Value
What High Means
Elevated TgAb levels indicate an autoimmune response against the thyroid gland. High levels are most commonly associated with Hashimoto's thyroiditis (chronic autoimmune thyroiditis), which is the leading cause of hypothyroidism. Elevated TgAb is also seen in Graves' disease, thyroid cancer (particularly papillary and follicular types), type 1 diabetes, and other autoimmune conditions like rheumatoid arthritis and pernicious anemia. In thyroid cancer patients, rising TgAb levels after treatment may suggest disease recurrence. Mildly elevated levels can also occur transiently during postpartum thyroiditis or subacute thyroiditis.
Possible Symptoms
Symptoms depend on the underlying condition. With Hashimoto's thyroiditis: fatigue, weight gain, cold intolerance, constipation, dry skin, hair loss, brain fog, depression, muscle weakness, and joint pain. With Graves' disease: weight loss, heat intolerance, anxiety, tremor, rapid heartbeat, insomnia, and eye bulging. Many people with elevated TgAb may be asymptomatic in early stages before thyroid function is significantly impaired.
What Low Means
Low or undetectable TgAb levels are normal and indicate the immune system is not producing significant antibodies against thyroglobulin. In the context of thyroid cancer monitoring, declining or absent TgAb after treatment is a favorable sign suggesting successful treatment and low likelihood of recurrence. There are no adverse health conditions associated with low TgAb levels.
Possible Symptoms
Low or absent TgAb levels are normal and not associated with symptoms. No clinical symptoms are linked to low thyroglobulin antibody levels.
Risk Factors
Hashimoto's thyroiditis, Graves' disease, papillary or follicular thyroid cancer, postpartum thyroiditis, family history of autoimmune thyroid disease, type 1 diabetes, other autoimmune disorders (rheumatoid arthritis, celiac disease, pernicious anemia, lupus), female sex (women are 5-8x more likely to have elevated TgAb), iodine excess, and environmental triggers such as stress, infections, and toxin exposure.
Actionable Advice
Supplements
- •Selenium (200mcg selenomethionine)
- •Vitamin D3
- •Zinc
- •Omega-3 fatty acids
- •Magnesium
- •Myo-inositol
- •N-acetyl cysteine (NAC)
- •Curcumin
- •Vitamin B12
- •Probiotics
Diet & Lifestyle
- •Adopt an anti-inflammatory diet rich in vegetables, healthy fats, and lean protein
- •Consider a gluten-free trial — gluten molecular mimicry may trigger thyroid autoimmunity in susceptible individuals
- •Manage stress through meditation, yoga, or breathwork — chronic stress worsens autoimmune flares
- •Ensure adequate but not excessive iodine intake (excess iodine can worsen TgAb)
- •Prioritize 7-9 hours of quality sleep to support immune regulation
- •Address gut health — intestinal permeability is linked to autoimmune thyroid disease
- •Reduce exposure to environmental toxins (BPA, pesticides, heavy metals)
- •Exercise regularly but avoid overtraining which can increase inflammation
- •Limit processed foods, refined sugars, and seed oils
- •Get regular sunlight exposure for vitamin D synthesis
Ask AI
Ask questions about your TgAb results, trends, and what you can do to optimize.
Historical Trend
Related Biomarkers
Resources & Studies
All Readings
| Date | Value | Change |
|---|---|---|
| 2026-01-28 | 1 IU/mL | 0.0 |
| 2025-08-25 | 1 IU/mL | — |