Are these the same test?

[Tanyaking]

Can anyone clarify for me if these two tests which are worded differently are in fact the same test please.

Thyroid Peroxidase Antibody

Anti-thyroid peroxidase

[Mary-intussuception]

Do you have a result to share? Is the abbreviated version TPO?

[Tanyaking in reply to Mary-intussuception]

Yes I’ve typed the results out below..no there’s no mention of TPO

[helvella Administrator Thyroid UK]

In years past, we would often see antibodies referred to as "anti-Thyroid Peroxidase antibodies" - a bit of a mouthful. In recent years we more often see it simplified to "Thyroid Peroxidase antibodies".

This dropping of the first "anti-" is widespread across all antibodies. Not universal, and there is obviously a huge amount of literature which used the convention of the time and will not be updated.

Simply, the answer is yes, they are the same.

[Tanyaking in reply to helvella]

Thank you in 2017 her result was

Thyroid peroxidase antibody....10.9 Kiu/L < 34 kIU/L

And in 2018 it was

19 IU/ml <34

So it’s doubled in a year ,would that indicate a test this year to see if it’s raised at All?

[Mary-intussuception in reply to Tanyaking]

My TPO (Thyroid Peroxidase Antibodies ) result was 300 when finally diagnosed with Hashimoto's Autoimmune Thyroiditis and Hypothyroidism.

Does she have any diagnosis of Hypothyroidism /Underactive Thyroid?

Does she have any symptoms? Have you looked up the list on the Thyroid UK website?

Have any other tests been done? Such as Thyroid Function Tests (Tfts):

FreeT3

FreeT4

TSH

What about Tg (Thyroglobulin ) and /or an Ultrasound scan of her Thyroid?

and any nutrients levels especially :

Vitamin D

B12

Folate

and Ferritin?

[helvella Administrator Thyroid UK in reply to Tanyaking]

Antibody levels do vary over time - and both test results were negative. I am pretty sure that that level of change could occur within a much shorter time than a year. And that had they been done at different times they could, possibly, have been the other way around.

However, there is no reason to NOT test again. Other than cost!