Thyroid Antibodies (incl. Thyroglobulin + Thyroid Peroxidase Antibodies)
A focused two-marker autoimmune thyroid blood test measuring Thyroglobulin Antibodies and Thyroid Peroxidase Antibodies for thyroid autoimmunity assessment.
Turnaround time
1-2 business days
Biomarkers count
1
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Overview of the Thyroid Antibodies Test
The Thyroid Antibodies test is a focused two-marker blood profile assessing autoimmune activity directed against two important thyroid proteins.
The profile measures Thyroglobulin Antibodies, commonly abbreviated to TgAb, and Thyroid Peroxidase Antibodies, commonly abbreviated to TPOAb.
Thyroid Peroxidase is an enzyme involved in the production of thyroid hormones.
Thyroglobulin is a protein produced within the thyroid gland and used as part of normal thyroid hormone synthesis.
In autoimmune thyroid disease, the immune system may produce antibodies against these thyroid components.
TPO antibodies are particularly associated with autoimmune thyroiditis, including Hashimoto’s thyroiditis, while Thyroglobulin Antibodies can provide additional information about autoimmune thyroid activity.
Antibody testing does not show how well the thyroid is currently producing hormones.
It is therefore often most useful alongside TSH, Free T4 and, where appropriate, Free T3.
The Thyroid Antibodies test costs £119.
Professional blood collection is available in clinic for an additional £35 or through an at-home phlebotomy visit for an additional £60.
What Does the Thyroid Antibodies Test Check?
This test measures 2 thyroid autoantibodies.
Thyroglobulin Antibodies
Detects autoantibodies directed against Thyroglobulin and provides information relevant to autoimmune thyroid activity.
Thyroid Peroxidase Antibodies
Detects autoantibodies directed against Thyroid Peroxidase, an enzyme involved in thyroid hormone production and commonly associated with autoimmune thyroid disease.
Who May Benefit From the Thyroid Antibodies Test?
The profile may be useful when autoimmune thyroid disease is being considered or additional information is needed after routine thyroid testing.
People with symptoms potentially associated with thyroid dysfunction - Antibody testing can provide autoimmune context.
People with a previous abnormal TSH or thyroid hormone result - Autoantibodies may help clarify whether an autoimmune process is present.
People with a family history of autoimmune thyroid disease - Genetic susceptibility can increase the likelihood of thyroid autoimmunity.
People with another autoimmune condition - Autoimmune diseases can occur together.
Women with thyroid-related fertility or pregnancy concerns - Thyroid autoantibody status may sometimes be clinically relevant.
People with a known thyroid condition who have never had antibody testing - TgAb and TPOAb can provide additional information about the underlying process.
People with persistent symptoms despite normal basic thyroid testing - Antibody testing may provide additional context but does not replace wider assessment.
How to Prepare
Do not stop Levothyroxine, Liothyronine or other prescribed thyroid medication solely for antibody testing without medical advice.
Symptoms and Reasons to Consider the Thyroid Antibodies Test
Thyroid antibodies themselves do not produce one specific symptom pattern.
Persistent tiredness - Thyroid dysfunction is one possible cause among many.
Unexplained weight change - Altered thyroid hormone activity can influence metabolism.
Feeling unusually cold - Can occur with reduced thyroid activity.
Heat intolerance or palpitations - Can occur with excessive thyroid hormone activity.
Hair thinning or dry skin - These can occur with thyroid disease but are non-specific.
Menstrual-cycle changes - Thyroid dysfunction can influence reproductive health.
Previous borderline thyroid results - Antibodies can provide further autoimmune context.
A family history of Hashimoto’s thyroiditis or other autoimmune thyroid disease - Antibody testing may be relevant.
Positive thyroid antibodies do not automatically mean that thyroid hormone levels are abnormal.
Likewise, a negative antibody result does not exclude every thyroid disorder.
TSH and thyroid hormone measurements remain important when current thyroid function is being assessed.
How to Book Your Thyroid Antibodies Test
The Thyroid Antibodies profile can be booked privately with professional blood collection.
Choose the Thyroid Antibodies Test
Select the £119 two-marker autoimmune thyroid profile.
Select your collection option
Choose in-clinic phlebotomy for +£35 or an at-home phlebotomy visit for +£60.
Attend your appointment
A trained healthcare professional collects the required venous blood sample.
Laboratory analysis
Thyroglobulin Antibodies and Thyroid Peroxidase Antibodies are measured.
Receive your results securely
Your authorised thyroid antibody report is delivered securely.
When Will I Receive My Results?
Results are generally expected within approximately 1 working day after laboratory receipt.
Occasional repeat or confirmatory analysis may extend reporting.
Understanding Your Results
A raised TPO antibody result can support the presence of autoimmune thyroid activity and is commonly associated with autoimmune thyroiditis.
Raised Thyroglobulin Antibodies provide additional evidence of thyroid-directed autoimmunity.
Antibody concentrations do not directly indicate whether the thyroid is currently underactive, overactive or functioning normally.
Some people have positive antibodies for years while TSH and thyroid hormone concentrations remain within their expected ranges.
Where current thyroid function needs assessment, TSH and Free T4 are particularly important.
If Graves’ disease is specifically suspected, Thyroid Receptor Antibodies are a different and more targeted investigation.
Why Book With London Blood Tests?
London Blood Tests provides both major thyroid autoantibody measurements in one focused profile.
Two thyroid autoantibodies - TgAb and TPOAb are assessed together.
Thyroglobulin Antibodies included - One major marker of thyroid-directed autoimmunity is measured.
Thyroid Peroxidase Antibodies included - An important marker associated with autoimmune thyroiditis is assessed.
Useful alongside thyroid hormones - The profile can complement TSH, Free T4 and Free T3 testing.
Fast turnaround - Results are generally expected within approximately one working day.
Flexible phlebotomy - Choose in-clinic collection for +£35 or an at-home phlebotomist for +£60.
Clear pricing - The Thyroid Antibodies profile costs £119, with collection charged separately.
Private Thyroid Antibodies Blood Test in London
London Blood Tests provides private Thyroid Antibodies testing in London for £119.
The profile measures Thyroglobulin Antibodies and Thyroid Peroxidase Antibodies.
Professional blood collection is available in clinic for +£35 or through an at-home phlebotomy visit for +£60.
Results are generally expected within approximately one working day.