Thyroid Blood Test (Peroxidase Antibodies)

The Thyroid Blood Test (Peroxidase Antibodies) detects an enzyme produced in the thyroid. This enzyme is important for converting T4 (a thyroid hormone) into T3, the hormone needed to activate your metabolism. The presence of antibodies to thyroid peroxidase can indicate that the body’s immune system is attacking the thyroid.


Why test for peroxidase antibodies?

Common reasons for this blood test are:

  • To investigate symptoms that could indicate a problem with your thyroid
  • To get a clear picture of your thyroid function and health
  • Monitor thyroid function over time.

Your blood test

Our phlebotomy-trained professionals will take a blood sample from you. This sample will be analysed in the UK by our authorised partners, TDL. By booking this blood test, you agree for us to share your personal information with TDL in order to process your test. We’ll make sure you consent to this at your appointment too.

Frequently Asked Questions

No, we will send you the results and recommend that you share these with your GP or fertility provider.

It is not unusual for some bleeding to occur under the skin following your blood test and sometimes this can extend a little further around the puncture site.  If this causes you concern, check with your practice nurse. 

Sometimes we cannot get a blood sample from you. This can be for many reasons, such as not being hydrated enough, feeling cold or having another blood test recently. We will always offer you another appointment so we can try again.

Visit our FAQs page for any further questions you may have.