Private Thyroid Function Test TSH, FT3 & FT4
If you have ongoing tiredness, unexplained weight changes, hair loss, anxiety, or other symptoms that could be linked to your thyroid, a thyroid function test can help identify whether your thyroid is working as it should. Every test begins with a GP consultation with Dr Faizal Secretary.
GP-led · Results explained in person · No referral needed
What is a thyroid function test?
The thyroid is a small gland in your neck that produces hormones regulating your metabolism, energy levels, heart rate, body temperature, and other essential functions. If the thyroid becomes underactive or overactive, it can cause a wide range of symptoms that are often mistaken for other health conditions.
A thyroid function test measures key hormones in your blood to assess how well your thyroid is working. These usually include:
TSH (Thyroid Stimulating Hormone)
The main screening test used to assess how well your thyroid is working.
FT4 (Free Thyroxine)
Measures the amount of thyroxine available in your bloodstream.
FT3 (Free Triiodothyronine)
Provides additional information where clinically appropriate, particularly if an overactive thyroid is suspected.
Together, these tests provide a clear picture of your thyroid function and whether further investigation or treatment may be needed.
Reviewed by Dr Faizal Secretary, MRCGP · GMC 7606534
When might you need a thyroid function test?
Thyroid disorders can develop gradually, and their symptoms often overlap with many other common conditions. A thyroid function test may be recommended if you are experiencing symptoms that do not have an obvious explanation. Common reasons for testing include:
- Persistent tiredness or fatigue
- Unexplained weight gain or weight loss
- Feeling unusually cold or unusually hot
- Hair thinning or hair loss
- Anxiety, low mood, or mood changes
- Palpitations or a fast heartbeat
- Constipation or ongoing digestive changes
- Changes to your menstrual cycle
- Fertility concerns
- A family history of thyroid disease
These symptoms do not always indicate a thyroid condition, but a GP assessment and appropriate blood tests can help identify whether your thyroid is contributing to them.
How Dr Faizal helps with your thyroid test
A thyroid function test is most valuable when it is guided by an experienced GP who understands your symptoms and medical history. During your consultation, Dr Faizal Secretary will discuss your current symptoms and how long you have had them, your medical and family history, any medications or supplements you are taking, and previous blood test results where relevant.
Based on this assessment, he will recommend the most appropriate thyroid investigations rather than arranging unnecessary tests, then explain your results clearly and discuss whether any treatment, monitoring, or further investigations are needed.
What does the thyroid function test include?
Every thyroid function test is recommended following a GP consultation to ensure the investigations are appropriate for your symptoms and medical history. Depending on your clinical assessment, Dr Faizal Secretary may arrange:
- Standard thyroid function testing (TSH, FT4 and FT3)
- Thyroid antibody tests where an autoimmune thyroid condition is suspected
- Additional blood tests for related symptoms, such as iron studies, vitamin B12, vitamin D, or diabetes screening
- Further investigations or specialist referral if your results require additional assessment
Rather than offering a fixed testing package, every investigation is selected according to your individual clinical needs, helping ensure you receive the most appropriate care.
Preparing for your thyroid blood test
For most people, no special preparation is needed before a thyroid function test. You can usually eat and drink as normal unless you have been advised otherwise. Before your appointment, it is important to let Dr Faizal know if you:
- Take thyroid medication
- Use biotin (vitamin B7) supplements, which can affect thyroid test results
- Are pregnant or planning a pregnancy
- Have recently had thyroid investigations or treatment
If any preparation is required, Dr Faizal will explain exactly what you need to do before your blood sample is taken.
What happens after your results?
Receiving your results is only the first step. Understanding what they mean is equally important. Once your thyroid blood test results are available, Dr Faizal Secretary reviews them personally and explains them in the context of your symptoms, medical history, and overall health. Depending on your results, he may recommend:
- Reassurance if your thyroid function is within the expected range
- Repeat testing to monitor any borderline results
- Lifestyle advice where appropriate
- Medication if treatment is clinically indicated
- Further investigations or referral to an endocrinologist if additional assessment is needed
Every recommendation is based on your individual circumstances, giving you personalised care rather than just a laboratory report.
Private vs NHS thyroid testing
Both NHS and private thyroid testing play an important role in diagnosing and monitoring thyroid conditions, but there are some important differences.
| Private thyroid testing | NHS thyroid testing |
|---|---|
| GP consultation before testing | Usually requested through your NHS GP |
| Tests recommended according to your symptoms and medical history | Investigations arranged according to NHS clinical guidelines |
| Faster appointments in many cases | Waiting times vary between practices |
| Results explained personally by Dr Faizal Secretary | Follow-up depends on your GP practice |
| Ongoing treatment, monitoring and specialist referrals if required | NHS referral pathway where appropriate |
| Does not affect your NHS GP registration | Requires NHS GP registration |
Many patients choose to use both NHS and private healthcare. A private consultation can provide quicker access to investigations while allowing you to remain fully registered with your NHS GP.
Why choose My Private Clinic for a thyroid function test?
Choosing where to have your thyroid function test is about receiving the right investigations, understanding your results, and having ongoing support if further care is needed.
GP-Led Assessment
Every thyroid investigation begins with a consultation with Dr Faizal Secretary, ensuring tests are recommended according to your symptoms and medical history.
Personalised Testing
Rather than offering fixed testing packages, investigations are tailored to your individual clinical needs.
Clear Results Explained
Your results are reviewed personally, giving you a clear understanding of what they mean and whether any further action is required.
Fast Access
Appointments are often available the same day or next day, helping you avoid unnecessary delays.
Ongoing Care
If treatment, repeat testing, or specialist referral is needed, Dr Faizal continues to oversee your care and guide you through the next steps.
Meet Dr Faizal Secretary
Dr Faizal Secretary graduated from the University of Manchester and has extensive experience across NHS General Practice and Acute Medicine. He founded My Private Clinic to provide patients with a more personal approach to healthcare, where appointments are never rushed and investigations are guided by clinical need rather than a one-size-fits-all approach.
"Good healthcare starts with listening properly."
Dr Faizal Secretary, MBChB MRCGP · Read the full clinical profile →
Pricing
There are no registration fees, membership costs, or hidden charges. The cost of your thyroid function test depends on the investigations recommended during your consultation. Dr Faizal will always discuss any costs with you beforehand, so you know exactly what to expect before any blood tests are arranged.
Frequently asked questions
What blood test checks thyroid function?
A thyroid function test usually measures TSH (Thyroid Stimulating Hormone) and may also include FT4 and FT3, depending on your symptoms and clinical assessment. These tests help assess how well your thyroid gland is working.
Do I need a GP referral for a private thyroid function test?
No. You can book directly with Dr Faizal Secretary without a referral. Every thyroid blood test is recommended following a GP consultation to ensure the investigations are appropriate for your individual circumstances.
Do I need to fast before a thyroid blood test?
In most cases, fasting is not required before a thyroid function test. However, certain medications or supplements may affect your results, and Dr Faizal will advise you if any preparation is needed before your appointment.
How quickly will I receive my results?
Most routine thyroid blood test results are available within a few working days, although turnaround times vary depending on the investigations requested. Dr Faizal will review your results and explain what they mean.
Can a thyroid blood test diagnose thyroid disease?
A thyroid function test provides valuable information about how your thyroid is working and can help identify conditions such as hypothyroidism or hyperthyroidism. Results are always interpreted alongside your symptoms and medical history.
Can I stay registered with my NHS GP?
Yes. Booking a private thyroid function test at My Private Clinic does not affect your NHS GP registration. Many patients choose to use both NHS and private healthcare.
Is a private thyroid function test worth it?
Many patients choose private testing because it offers quicker access to appointments, longer GP consultations, and clear explanations of their results. Rather than simply receiving laboratory values, you will understand what your results mean and whether any further treatment or investigation is needed.
Related blood test pages
Depending on your symptoms and overall health, Dr Faizal Secretary may recommend additional investigations alongside your thyroid function test.
Wider checks & services
Book a private thyroid function test consultation
If you are experiencing symptoms that could be linked to a thyroid condition, or would like reassurance about your thyroid health, a GP consultation can help determine whether a thyroid function test is appropriate for you. Dr Faizal will recommend the right investigations, explain your results clearly, and guide you through any treatment or further care if needed.