Anti-Thyroid Peroxidase Antibody (Anti-TPO)
Anti-TPO detects antibodies against thyroid peroxidase, an enzyme essential for thyroid hormone synthesis. High levels are strongly linked to autoimmune thyroid diseases including Hashimoto's thyroiditis and Graves' disease.
12 hours
Turnaround
Blood
Sample
What the Anti-Thyroid Peroxidase Antibody (Anti-TPO) test tells you
Thyroid peroxidase is the enzyme the thyroid gland relies on to build its hormones: it attaches iodine to the storage protein held inside the gland so that thyroid hormone can be assembled. This test looks for antibodies directed against that enzyme, and their presence indicates that the immune system is acting against thyroid tissue itself.
Anti-TPO is the most sensitive laboratory marker of autoimmune thyroid disease. It is found in the great majority of people with Hashimoto's thyroiditis, the commonest cause of an underactive thyroid, and in many people with Graves' disease. Where thyroid results sit close to the edge of normal, the presence of antibodies raises the likelihood that thyroid function will decline over the years, which usually changes how closely your doctor arranges follow-up. The test also identifies women more likely to develop thyroid problems during pregnancy or in the months after delivery.
What matters just as much is what a positive result does not mean. Thyroid antibodies are common in the general population, including in people whose thyroid function is entirely normal and who never go on to develop thyroid disease at all. A positive result describes autoimmune activity and a raised likelihood of future dysfunction; it is not a diagnosis and not by itself a reason to start treatment. Your doctor reads it beside your TSH, your free hormone levels and your symptoms, and follows those rather than the antibody level over time.
Ordered when TSH is abnormal, there is a family history of thyroid disorders, or during pregnancy to assess the risk of postpartum thyroiditis.
When TSH is abnormal, a positive result tells your doctor the immune system is driving it rather than something else.
In borderline thyroid results, antibodies raise the likelihood that function will decline and change how closely you are followed.
Antibodies identify women more likely to develop thyroid problems during pregnancy or in the months after delivery.
Because levels change slowly, one clear result usually answers the autoimmune question for a long time.
Reasons your doctor may request the Anti-Thyroid Peroxidase Antibody (Anti-TPO) test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Symptoms & thyroid findings
Symptoms of an underactive thyroid such as fatigue, cold intolerance, constipation or weight gain.
A diffusely enlarged thyroid or a goitre found on examination or ultrasound.
An unexplained TSH result
A raised TSH, with or without symptoms, where the cause has not been established.
Family history, pregnancy & autoimmunity
Planning a pregnancy, or thyroid changes during pregnancy or after delivery.
A first-degree relative with autoimmune thyroid disease alongside borderline thyroid results.
Another autoimmune condition, such as type 1 diabetes or coeliac disease, with thyroid symptoms.
No fasting window — pick any slot that suits you, online or on WhatsApp.
A DHA-licensed nurse collects your sample at home or in the office — free home collection.
A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.
Anti-TPO is the most sensitive marker of autoimmune thyroid disease.
Ranges are a guide — your physician interprets your result alongside your symptoms and history.
What a higher result can point to
- Hashimoto's thyroiditis, by far the commonest reason for a strongly positive result.
- Graves' disease, where peroxidase antibodies frequently accompany the overactive picture.
- Postpartum thyroiditis in the months following delivery.
- Other autoimmune conditions, which cluster with thyroid autoimmunity.
- Antibodies in someone with entirely normal thyroid function, which is common in the general population and often lifelong.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests — your doctor decides what it means for you.
What this test cannot tell you
- A negative or absent result has no established significance of its own and does not exclude thyroid disease, since some autoimmune thyroid conditions occur without detectable antibodies.
- Antibodies are common in people whose thyroid never becomes underactive, so a positive result is not a diagnosis and not by itself a reason for treatment.
- The level does not indicate how severe the thyroid problem is and is not used to guide hormone dosing.
- High-dose biotin supplements and differing laboratory methods can both alter the reported value.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 1Thyroid peroxidase is the enzyme the gland needs to build its hormones; the test detects antibodies against it.
- 2It is the most sensitive laboratory marker of autoimmune thyroid disease.
- 3Positive results are common in healthy people, so the finding explains a cause rather than making a diagnosis.
- 4A negative result carries limited weight and does not rule autoimmune disease out.
- 5Levels are not repeated to monitor treatment, since TSH and free hormones do that job.
Frequently Asked Questions
Everything you need to know about the Anti-Thyroid Peroxidase Antibody (Anti-TPO) test. Can't find what you're looking for?
Talk to our team→This is a common combination, and many people stay in it for life. It means an autoimmune process is present without a measurable effect on hormone output, so your doctor typically arranges periodic thyroid function checks rather than starting any treatment.
Hormone replacement corrects the hormone deficit, not the immune process, so antibodies usually persist. That is why your doctor follows TSH and free hormone levels rather than the antibody level to judge whether the dose is right.
Thyroid demand rises during pregnancy, and a gland already under immune attack is less able to meet it. Knowing your antibody status beforehand lets your doctor monitor thyroid function more closely through pregnancy and the months after delivery.
There is no established way to bring antibody levels down, and lowering them is not the treatment goal in any case. Care is directed at keeping thyroid hormone levels where they should be and watching for change over time.
Anti-TPO detects antibodies against thyroid peroxidase, an enzyme essential for thyroid hormone synthesis. High levels are strongly linked to autoimmune thyroid diseases including Hashimoto's thyroiditis and Graves' disease.
Ordered when TSH is abnormal, there is a family history of thyroid disorders, or during pregnancy to assess the risk of postpartum thyroiditis.
No, fasting is not required for the Thyroid Autoantibody (Anti-TPO) test, so you can eat and drink normally beforehand.
The Thyroid Autoantibody (Anti-TPO) test uses a blood sample, collected quickly by our DHA-licensed phlebotomist with minimal discomfort.
Results for the Thyroid Autoantibody (Anti-TPO) test are typically ready within 12 hours. You will receive a secure digital report, and your Smart Report highlights anything outside the normal range.
The Thyroid Autoantibody (Anti-TPO) test is AED 219, which includes free home sample collection and a physician-reviewed report. You can also build a custom panel and pay only for the markers you choose.
Yes. A DHA-licensed phlebotomist can collect your sample at home or the office anywhere in Dubai at no extra cost, 7 days a week. See how it works.
It is commonly chosen by adults. If you are not sure it is right for you, our care team is happy to advise.
Add the Thyroid Autoantibody (Anti-TPO) test to your cart and complete the short booking wizard, choosing home collection or a lab visit. Guest checkout lets you book without creating an account.
Yes. It is processed at our EIAC-accredited laboratory (ISO 15189:2022) under DHA license 0046381 and verified by board-certified pathologists.
Every report includes reference ranges and plain-language notes. If you have questions, our care team can arrange a clinician review — just get in touch.
Absolutely. Add it to a curated health package or bundle it with any of our 160+ biomarkers, often from a single sample in one visit.