1,25-dihydroxyvitamin D (calcitriol)
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Thyroid Profile 3
72.60
Thyroid Profile 3 measures TSH, Free T3, and Free T4 to assess how well your thyroid is functioning. It is commonly used for diagnosis and ongoing monitoring of thyroid conditions.
Turnaround time
2 days
Biomarkers count
3
Same-Day Appointments
UKAS Accredited Labs
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Under 18? Patients under 18 can only be seen at GB Medlabs and Clinilabs, Monday to Friday only.
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Details about Thyroid Profile 3
What is the Thyroid Profile 3 test?
Thyroid Profile 3 is a focused blood test that evaluates thyroid function using three key markers: Thyroid Stimulating Hormone (TSH), Free T4, and Free T3. Together, these markers assess how the thyroid gland is regulated and how much active hormone is available to the body.
TSH reflects pituitary signalling to the thyroid, Free T4 represents hormone production, and Free T3 shows the active hormone available at tissue level. This combination provides a clearer picture than TSH alone.
The test is widely used for both initial thyroid assessment and routine monitoring once a diagnosis has been made.
Why do I need a Thyroid Profile 3 test?
Thyroid disorders often cause broad symptoms and may be missed if only one marker is checked. Measuring TSH alongside Free T3 and Free T4 improves diagnostic accuracy and treatment monitoring.
You may benefit from this test if you experience:
- Persistent fatigue or low energy
- Weight gain or unexplained weight loss
- Cold or heat intolerance
- Hair thinning or hair loss
- Palpitations or tremors
- Anxiety, low mood, or brain fog
- Changes in appetite or bowel habits
- Known thyroid condition requiring monitoring
- Follow-up after medication changes
This profile helps confirm whether symptoms are linked to thyroid hormone imbalance and supports safe long-term management.
Benefits of the test
- Balanced thyroid assessment
Evaluates regulation, production, and active hormone levels. - More informative than TSH alone
Free hormone levels add essential clinical context. - Detects underactive and overactive patterns
Identifies hypothyroid and hyperthyroid states. - Useful for treatment monitoring
Helps assess response to thyroid medication. - Explains persistent symptoms
Clarifies cases where symptoms continue despite treatment. - Supports dose optimisation
Helps reduce over- or under-treatment risk. - Simple blood-based testing
Requires only one blood sample. - Suitable for ongoing follow-up
Ideal for repeat testing and trend tracking.
Step-by-step: How we offer testing
Clinic-based testing (UK-wide)
- Choose your nearest UK clinic
- Attend your appointment
- A clinician draws a blood sample
- Sample is sent to the laboratory
- Results are issued once analysis is complete
Home or hotel visit (+£60, UK-wide)
- Book a mobile phlebotomist
- Blood sample taken at your home or hotel
- No need to attend a clinic
- Sample securely transported to the laboratory
Your results explained
Underactive thyroid pattern (hypothyroid)
- Raised TSH with low Free T4 and/or Free T3
- UK standards (typical):
- TSH: >4.5 mIU/L
- Free T4: <10 pmol/L
- May be associated with fatigue, weight gain, cold intolerance
Normal thyroid function (euthyroid)
- TSH, Free T4, and Free T3 within reference range
- UK standards (typical):
- TSH: 0.4–4.0 mIU/L
- Free T4: 10–22 pmol/L
- Free T3: 3.1–6.8 pmol/L
- Suggests balanced thyroid hormone regulation
Overactive thyroid pattern (hyperthyroid)
- Suppressed TSH with elevated Free T4 and/or Free T3
- UK standards (typical):
- TSH: <0.1 mIU/L
- Free T4: >22 pmol/L
- May be associated with palpitations, anxiety, heat intolerance
How It Works
Simple steps to get your results
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Book Online
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
2
Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
3
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
Take control of your health with London Blood Tests
WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.
Frequently Asked Questions
Free T3 reflects the active hormone available to tissues.
Yes, it is commonly used for follow-up and dose adjustment.
Yes, symptoms may have other causes and need broader assessment.
No, antibody tests are required to assess autoimmunity.
Stress and illness can temporarily affect hormone levels.
Yes, thyroid disorders affect all genders.
Yes, especially during treatment changes or illness.
Fasting is not usually required.
Yes, some medications can affect thyroid hormone levels.
It indicates altered thyroid hormone regulation and supports further clinical evaluation.
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