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The vast majority of thyroid hormones circulating in the blood are bound to carrier proteins. This test measures the level of the active thyroid hormone T3 which is free (not bound to protein) and therefore available to your cells to regulate metabolism. Raised levels of FT3 indicate an overactive thyroid whereas low levels indicate that your thyroid is not producing enough thyroid hormones.
Other factors may influence your FT3 levels, such as your ability to convert T4 to T3 as well as the number of carrier proteins in your blood stream: raised levels of proteins may mean that you have insufficient FT3 available for your cells.
This test is for people who have symptoms of an abnormal thyroid function or who wish to check an already diagnosed condition. This test is often used as a follow-up to an abnormal thyroid test to gain further insights into the diagnosis.
We send you an easy-to-use kit to collect your blood sample.
Post your sample to our lab in the prepaid envelope provided.
View results securely in your own personal dashboard.
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.
Triiodothyronine (T3) is one of two thyroid hormones produced by the thyroid gland. Most T3 is bound to protein in the blood. Free T3 measures the level of T3 that is free, or unbound to protein, and is available to regulate metabolism.
We will send you your Free T3 finger-prick blood test sample collection kit which contains everything you need to take your blood sample in the comfort of your own home. If you are unsure about completing a finger-prick blood sample collection you will have the opportunity to select a clinic-based venous blood sample option during the checkout process.
How to collect a finger-prick blood sampleYour Free T3 test includes 1st class postage and packaging for you to send your blood sample directly to our laboratory for analysis. If you live in an area where you cannot rely on the post or you simply want to ensure that your sample arrives at the laboratory the following day, you may wish to send your blood sample guaranteed next day delivery for extra reassurance.
Your blood sample will be analysed at one of our chosen laboratories. You can be assured of fast, accurate results from one of our accredited independent providers of clinical diagnostic tests.
Our medical team will comment on out-of-range blood test results and give you follow-up advice where necessary. If you need it, a PDF copy of your Free T3 test results can be downloaded for your doctor.
Once you have placed your order you can visit my.medichecks.com where you can manage your account, track your orders and view your Free T3 test results.
Stay motivated by filling in your online health and lifestyle questionnaire and seeing how improvements in your lifestyle can influence your test results. Your medical and family history gives us vital information when interpreting your results.
