The Anti-Thyroglobulin Antibodies (Anti-TG) Blood Test detects antibodies directed against thyroglobulin, a key thyroid protein. It is used to assess autoimmune thyroid disease, including Hashimoto’s thyroiditis and Graves’ disease, and to support thyroid health evaluation. Testing is performed in a UKAS-accredited laboratory, with an optional GP consultation.

What is the Anti-Thyroglobulin Antibodies Test?

Thyroglobulin is a protein produced by the thyroid gland and is essential for the synthesis of thyroid hormones (T3 and T4). In autoimmune thyroid conditions, the immune system may mistakenly produce antibodies against thyroglobulin, leading to inflammation and impaired thyroid function.

The Anti-TG test helps identify immune-mediated damage to the thyroid and is often used alongside:

• Thyroid function tests (TSH, Free T4, Free T3)

• Anti-thyroid peroxidase antibodies (Anti-TPO)

Anti-TG antibodies may be present even before thyroid hormone levels become abnormal, making the test valuable for early detection.

At London Blood Tests, Anti-TG antibodies are measured using validated immunoassay techniques aligned with UK endocrinology standards.

Benefits of the Anti-TG Antibodies Test

1. Detects Autoimmune Thyroid Disease
   Identifies immune-related thyroid dysfunction.

2. Supports Diagnosis of Hashimoto’s Thyroiditis
   Commonly elevated in autoimmune hypothyroidism.

3. Useful in Graves’ Disease Assessment
   Helps assess autoimmune activity affecting the thyroid.

4. Assists Early Thyroid Dysfunction Detection
   Antibodies may appear before hormone changes.

5. Complements Other Thyroid Tests
   Enhances interpretation of TSH, T3, and T4 results.

6. Non-Invasive & Simple Blood Test
   Requires only a standard blood sample.

7. Optional GP Consultation for Interpretation
   Results reviewed with a GP for clinical guidance.

Why Do I Need an Anti-TG Antibodies Test?

You may benefit from this test if you:

• Have symptoms of thyroid dysfunction

• Have abnormal thyroid hormone levels

• Have a family history of thyroid disease

• Have other autoimmune conditions

• Are monitoring known autoimmune thyroid disease

Common symptoms associated with autoimmune thyroid disease include:

• Fatigue

• Weight changes

• Cold or heat intolerance

• Hair thinning

• Mood changes

• Neck discomfort or swelling

Because autoimmune thyroid disease can progress gradually, antibody testing helps clarify the underlying cause.

How the Test Works

In-Clinic Testing at London Blood Tests

1. Book Your Appointment

   • Online or phone booking

   • No fasting required

2. Pre-Test Review

   • Inform the clinician of thyroid symptoms or medication use

3. Sample Collection

   • Venous blood sample collected by a trained phlebotomist

   • Takes 5–10 minutes

4. Laboratory Analysis

   • Performed in a UKAS-accredited laboratory

5. Quality Control

   • Results verified before release

6. Results Delivery

   • Results typically available within 1–2 business days

7. Optional GP Consultation

   • Review findings and management options

At-Home Blood Draw (Home or Hotel Phlebotomy – UK-Wide)

1. Book a Phlebotomist Visit

   • Convenient home or hotel blood draw

2. Professional Sample Collection

   • Conducted by a certified phlebotomist

3. Secure Transport

   • Sample couriered same day

4. Laboratory Testing

   • Identical analysis to clinic testing

5. Results & Follow-Up

   • Online results, GP review optional

Your Anti-Thyroglobulin Antibodies Results – Explained

Results are reported in IU/mL.

Typical UK reference guidance:

• Negative / Normal: < 115 IU/mL (ranges may vary by lab)

Interpretation:

• Positive / Elevated Anti-TG: suggests autoimmune thyroid disease

• Normal Anti-TG: autoimmune thyroid disease less likely

Important notes:

• Anti-TG antibodies can be present even with normal thyroid function

• Results should be interpreted alongside TSH, Free T4, Free T3, and Anti-TPO antibodies