Thyroid hormones work together.
This profile measures thyroid stimulating hormone (TSH), free triiodothyronine (Free T3), and free thyroxine (Free T4), providing a more complete picture of thyroid hormone levels than a basic thyroid check.
By assessing these three markers together, it offers additional information about thyroid function at the time of testing.
You might consider this test if you’re reviewing your thyroid health, have been advised to check your thyroid hormone levels, would like a more detailed thyroid assessment, or want baseline results to monitor over time.
- Prepare for your test by following these instructions.
- Take your sample between 6am and 10am.
- Take your sample at least 24 hours after any vitamin or mineral supplements.
- Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed.
- If you take levothyroxine or desiccated thyroid extract (DTE), take your blood test before your dose for the most accurate thyroid function results.
- If you have to take your blood test later in the day, aim to leave at least six hours between taking levothyroxine medication and your blood draw (or 12 hours after DTE/T3 medication).
- Please also let us know in the supporting information if you take amiodarone or lithium, as these can also affect your results.
What’s included:
- Professional blood sample collection
- Blood test kit included
- Laboratory testing by a UKAS-accredited UK laboratory
- Personalised doctor-reviewed report
- Results usually available within 4-5 working days
- Clinic and mobile appointment options available
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Your phlebotomist will make sure you are comfortable before starting and explain what will happen.
The blood draw itself usually takes only a few minutes. Most people describe the feeling as a small scratch or pinch.
We will check that you feel well before you leave. If you are nervous about blood tests, have difficult veins or have fainted before, please tell us so we can support you during your appointment.
You can book an appointment at our Swindon clinic or choose a mobile visit at your home or workplace.
Mobile appointments are available across Swindon and surrounding areas. Travel fees may apply outside Swindon.
Preparation depends on the test you have chosen.
Some tests need no special preparation. Others may need fasting, a certain time of day, or changes to supplements before your appointment.
Any specific instructions will be shown with your test and sent to you when you book.
It can also help to stay well hydrated before your blood draw unless your test instructions tell you otherwise.
After your blood draw, keep the plaster or dressing in place for around 30–60 minutes.
A small amount of tenderness or bruising can sometimes happen afterwards and usually settles within a few days.
Try to avoid heavy lifting with that arm for at least a few hours after your blood draw. If you notice a small bruise, a cold compress may help.
If you feel unwell or have concerns after your appointment, please contact us.
Yes. This appointment is suitable if you already have a blood test kit or blood request form and simply need a qualified phlebotomist to collect your blood sample.
Yes, please send us a screenshot of your blood form or the instructions included with your test kit before your appointment. This allows us to check the samples, tubes and any additional requirements in advance.
Please bring your blood request form or complete blood test kit with you. If you have already sent us the information beforehand, bringing the original documents or kit instructions is still recommended.
Yes, we can provide centrifuging for suitable tests, but this is an additional service and must be booked where required. Please send us your blood form or test kit instructions in advance so we can confirm exactly what your test requires.
Still got questions?
Visit our Health Hub for more information or get in touch.