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Thyroid UK
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Understanding results?

Hi Everyone, new here.

I had a blood test done by Blue Horizon Medicals as suggested by Thyroid UK as I've never trusted my GP practice to give me the answers I need as I have Fibromyalgia and every new symptom I get is attributed to it.

I am seeing my GP tomorrow with a copy of the results but I'm still a little bamboozled by what they actually mean, especially at the TOTAL THYROXINE (T4) is normal, but some of the other results are not. Can anyone shed a bit of light before I see my GP. That would be a great help.

TOTAL THYROXINE(T4) 105 nmol/L (59 - 154)


FREE THYROXINE * 22.8 pmol/l (12.0 - 22.0)

FREE T3 6.8 pmol/L (3.1 - 6.8)

Thyroglobulin Antibody * 487.0 IU/mL (0-115)

Method used for Anti-Tg: Roche Modular

Thyroid Peroxidase Antibodies * 115.0 IU/mL (0 - 34)

Thyroid microsomal antibody assays using

semi-quantitative agglutination titres are no longer available, and the more specific and quantitative assay for antibodies to thyroid peroxidase will now be the only assay used. These assays are clinically equivalent and have been offered in parallel for several years.

Thanks in advance, hopefully looking to feel a lot better than I have of late.


3 Replies

Your antibodies are high. When your immune system attacks your thyroid some of its cells are destroyed dumping lots of hormone into your system, tsh goes low and t3 goes high. Hopefully doctor will order new tests in about 6 weeks when your readings will likely be very different. I wouldn't be suprised if your fibromyalgia is really an underactive thyroid caused by autoimune thyroiditis also known as hashimoto's disease. Do you have any blood test results from an earlier time?


Total Thyroxine is a virtually useless test, and I don't know why they continue to do it. Just ignore it. What interests you is the FT4 (Free T4).

The most important question is: how do you feel on those results? However, as you have Hashi's, as Greybeard says, you should wait for the next test to see how things progress before you start messing with your dose. :)


You may find that your GP will want to reduce your dose based on the low TSH and the just over range FT4 and top of range FT3. Try to avoid this and ad Greybeard says retest.


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