Thyroid Peroxidase Antibodies
Private Thyroid Peroxidase Antibodies testing in London for £56.99, measuring one autoimmune thyroid marker with results expected in around 1 day.
Turnaround time
2 days
Biomarkers count
1
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Overview of the Thyroid Peroxidase Antibodies Test
The Thyroid Peroxidase Antibodies blood test detects autoantibodies directed against thyroid peroxidase, an enzyme required for normal thyroid hormone production.
The test assesses 1 specialist autoimmune marker: Thyroid Peroxidase Antibodies.
Thyroid peroxidase, commonly abbreviated to TPO, is located within thyroid tissue and helps incorporate iodine into the biochemical process used to produce Thyroxine and Triiodothyronine.
In autoimmune thyroid disease, the immune system can produce antibodies that recognise this enzyme.
Thyroid Peroxidase Antibodies, or TPOAb, are strongly associated with Hashimoto's thyroiditis.
Hashimoto's is one of the most common causes of primary hypothyroidism.
TPO antibodies can also occur in Graves' disease and in some people who currently have normal thyroid hormone concentrations.
This means a positive TPO antibody result demonstrates thyroid autoimmunity, but does not by itself show whether the thyroid is currently underactive or overactive.
TSH and Free T4 are required to assess current thyroid function.
TPO antibodies can sometimes be present for years before obvious biochemical thyroid dysfunction develops.
Their presence can therefore provide useful context where TSH is borderline or where a person has a strong family or personal history of autoimmune thyroid disease.
Antibody concentration can fluctuate over time.
Repeated antibody measurements are not always necessary once thyroid autoimmunity has been established because management is generally guided more by thyroid function than by antibody concentration alone.
During pregnancy and fertility assessment, thyroid autoimmunity may also be clinically relevant and should be interpreted with TSH, Free T4 and specialist guidance where needed.
What Does the Thyroid Peroxidase Antibodies Test Check?
The test detects antibodies directed against thyroid peroxidase and provides evidence of autoimmune activity affecting the thyroid gland. This test measures 1 specialist biomarker.
Thyroid Peroxidase Antibodies
Measures autoantibodies against thyroid peroxidase, supporting assessment of Hashimoto's thyroiditis and other forms of autoimmune thyroid disease.
Who May Benefit From the Thyroid Peroxidase Antibodies Test?
TPO antibody testing can be useful when thyroid dysfunction may have an autoimmune cause.
People with a raised TSH result - TPO antibodies can help determine whether autoimmune thyroiditis is contributing to reduced thyroid function.
People with suspected Hashimoto's thyroiditis - TPOAb is one of the principal laboratory markers associated with Hashimoto's disease.
People with fluctuating thyroid results - Autoimmune thyroid activity can produce changing thyroid function over time.
People with a family history of autoimmune thyroid disease - Autoimmune thyroid conditions commonly cluster within families.
People with another autoimmune disorder - Autoimmune conditions can coexist.
People with thyroid symptoms despite currently normal hormone results - Antibodies can occasionally appear before overt biochemical thyroid dysfunction.
People with fertility or pregnancy concerns where thyroid autoimmunity is relevant - TPO antibodies may provide additional endocrine context.
People with a previous positive thyroid antibody result - Broader thyroid-function testing can establish whether hormone production has changed.
How to Prepare
There is usually no need to stop thyroid medication for TPO antibody testing.
Once thyroid autoimmunity is established, repeat TPO measurements are often less important than monitoring TSH and thyroid hormone levels.
Symptoms and Reasons to Consider the Thyroid Peroxidase Antibodies Test
TPO antibodies themselves do not cause a specific symptom pattern. Symptoms develop if autoimmune thyroid disease affects hormone production.
Persistent fatigue or low energy - Hypothyroidism associated with autoimmune thyroiditis can cause tiredness.
Cold intolerance - Reduced thyroid hormone activity can affect temperature regulation.
Unexplained weight gain - Hypothyroidism can contribute to reduced metabolic activity.
Hair thinning or dry skin - Thyroid dysfunction can affect hair and skin.
Constipation - Reduced thyroid hormone activity can slow gastrointestinal motility.
Irregular menstrual cycles - Thyroid dysfunction can influence reproductive hormone regulation.
A raised or fluctuating TSH result - TPO antibodies can help identify an autoimmune cause.
A family history of Hashimoto's thyroiditis - Autoimmune thyroid disease can run in families.
A positive TPO antibody result does not establish whether thyroid hormone production is currently normal, low or excessive.
TSH and Free T4 are required to assess current thyroid function.
Do not start or change thyroid medication based only on the antibody concentration.
How to Book Your Thyroid Peroxidase Antibodies Test
The Thyroid Peroxidase Antibodies test can be booked privately for focused assessment of autoimmune thyroid activity.
Choose the Thyroid Peroxidase Antibodies
Select the individual TPO antibody blood test online.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy where suitable.
Attend your appointment
A trained healthcare professional collects the required venous blood sample.
Laboratory analysis
Your serum undergoes measurement of Thyroid Peroxidase Antibodies.
Receive your results securely
Your authorised result is delivered securely and can be interpreted alongside TSH, Free T4 and other thyroid antibodies where appropriate.
When Will I Receive My Results?
The specialist laboratory turnaround for Thyroid Peroxidase Antibodies is approximately 1 day after laboratory receipt.
The sample undergoes thyroid autoantibody measurement, quality-control procedures and laboratory authorisation.
Turnaround begins when the specimen reaches the laboratory rather than necessarily from the exact time of blood collection.
Understanding Your Results
A negative result means TPO antibodies were not detected above the laboratory's validated threshold.
This makes TPO-associated thyroid autoimmunity less likely but does not exclude every autoimmune thyroid condition.
A positive result indicates antibodies against thyroid peroxidase are present.
This strongly supports autoimmune thyroid activity when interpreted in the appropriate clinical setting.
TPO antibodies are particularly associated with Hashimoto's thyroiditis.
They can also occur in Graves' disease and in some otherwise healthy people.
The antibody level does not directly measure how underactive or overactive the thyroid is.
TSH and Free T4 provide that information.
Some people remain antibody-positive for many years without requiring thyroid hormone treatment.
Clinical management should therefore be based on thyroid function, symptoms and the broader clinical context rather than antibody concentration alone.
Why Book With London Blood Tests?
London Blood Tests provides private TPO antibody testing for focused assessment of autoimmune thyroid disease.
Measures a principal thyroid autoantibody - TPO antibodies are strongly associated with autoimmune thyroid disease.
Relevant to Hashimoto's thyroiditis - TPOAb is one of the key laboratory markers used when Hashimoto's is suspected.
Can explain an abnormal TSH pattern - Antibody testing can identify an autoimmune basis for thyroid dysfunction.
Can be positive before hormone changes develop - Thyroid autoimmunity can precede overt hypothyroidism.
Can complement Thyroglobulin Antibodies - Measuring both can provide a broader autoimmune thyroid picture.
Rapid specialist turnaround - Results are expected approximately 1 day after laboratory receipt.
Professional blood collection - Clinic and suitable home or hotel phlebotomy appointments are available.
Clear pricing - The Thyroid Peroxidase Antibodies test costs £56.99.
Private Thyroid Peroxidase Antibodies Blood Test in London
London Blood Tests provides private Thyroid Peroxidase Antibodies testing for people requiring assessment of autoimmune thyroid activity.
The test costs £56.99 and measures 1 specialist biomarker.
Results are expected approximately 1 day after laboratory receipt.
The result should be interpreted alongside TSH and thyroid hormone measurements rather than used alone to determine current thyroid function.