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Thyroid Check UltraVit rT3 Blood Test
Thyroid Check UltraVit rT3 Blood Test contents
Results on my.medichecks health portal
Thyroid Check UltraVit rT3 Blood Test

Thyroid Check UltraVit rT3 Blood Test

Our most comprehensive thyroid profile taking a complete look at thyroid function, ferritin, folate, vitamin B12, vitamin D and reverse T3.

Is it for you?

Do you have symptoms like fatigue, weight gain and dry skin and hair that you think could be thyroid related? Are you taking levothyroxine but are not getting the improvement you expected? Are you working with a practitioner who has recommended a full blood work-up including reverse T3 to see if there may be an underlying health issue that could be causing your symptoms? If so, our most comprehensive thyroid panel is for you.
Blood sample 12 tests included 14 working days turnaround


Key biomarkers - see full list below

  • You have symptoms of an underactive thyroid
  • You are taking thyroid medication and are concerned that you are not converting to T3 effectively
  • You want to optimise your nutrition to support your thyroid function
  • You have been advised to test your reverse T3 levels
This profile is our most comprehensive test for a detailed picture of your thyroid health, including TSHFT3FT4 as well as thyroid antibodies which can indicate whether an autoimmune disorder is causing your symptoms. This profile also includes tests for important nutritional markers for thyroid health. Deficiencies in vitamin Dvitamin B12folate and ferritin can not only cause symptoms which can be confused with an underactive thyroid, but are also thought to play a role in optimum thyroid function. We include CRP-hs, an inflammation marker which can be elevated in autoimmune conditions. 

This profile also tests for reverse T3 (rT3). Some health practitioners advise testing rT3 levels to help identify problems in converting thyroxine (T4) to T3. Currently there is very little scientific research to support the significance of elevated rT3 outside of a hospital or intensive care setting and there are no treatment protocols within conventional medicine. Please liaise with your specialist practitioner who can interpret these results in the context of your symptoms and any medication you may be taking before ordering this test.
Active B12 levels can be affected by use of vitamin B12 supplements. If you are taking an oral supplement then we recommend not taking it for one week prior to the test to ensure an accurate measure of your B12 levels. If vitamin B12 is being prescribed to you by your doctor then you should discuss with them how long to omit B12 supplements for.

3 simple steps

  • Take the test

    Take the test - either using your kit or visit a clinic.
  • Post your sample

    Send your sample in the freepost pack to our fully accredited lab.
  • Get your results

    Get your doctor reviewed results on
Expert interpretation<br>
of your results

Expert interpretation
of your results

One of our team of doctors will review your results and give you personalised advice based on your medical history, lifestyle and health and fitness goals.

Your personal<br>
health centre

Your personal
health centre

Discover the easy way to track your health through our online portal, View your results with doctor's advice, monitor any changes over time and see the improvements you can make to your health with simple lifestyle changes.

Questions? Let us help

Questions? Let us help

Our customer care team are on-hand to help you find the test that's right for you. Get in touch via phone, live chat or email.

you can trust

Trusted by the NHS and private clinics alike, you can be sure of the highest testing standards from our partner laboratories

What our customers say

We ask every Medichecks customer about their experience - read what they have to say


Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.