Comprehensive Thyroid
Blood Test
Private Comprehensive Thyroid Blood Test at Home with nurse visit. Test TSH, T4, T3 & antibodies. Detect hypothyroidism, hyperthyroidism, Hashimoto's & Graves'.
fast (water is allowed) 12 hours prior to the test
Book online
Choose date & time that suits you
Nurse visits you
At home or your preferred location
Lab analysis
UK accredited laboratory
Results delivered
Secure digital report in 1–2 days
Why take this test?
* Dry skin * Fatigue * Increased sensitivity to the cold * Constipation * Slow heart rate * Weight gain * Memory issues * Depression * Weakness * Anxiety * Nervousness
This test is recommended if you:
What does it test?
Not all thyroid problems show up clearly on standard tests.
You might have normal hormone levels but still experience fatigue, weight changes, or brain fog. In many cases, this can be caused by an underlying autoimmune condition affecting the thyroid.
This advanced test goes further — helping you understand not just what’s happening, but why it’s happening.
✔ Goes beyond hormone levels to look for root causes ✔ Detects autoimmune thyroid conditions early ✔ Helps explain ongoing symptoms despite “normal” results
Professional blood draw included — accurate, in-depth results you can trust.
How to Prepare
Thyroid function testing does not require fasting, so you can prepare for your thyroid blood test at home with minimal disruption to your normal routine.
No fasting needed – you can eat and drink normally before your test. Thyroid hormone levels (TSH, Free T4, Free T3) are not affected by food or drink on the day of testing. Morning testing preferred (but not essential) – TSH levels are naturally higher in the morning and lower in the afternoon, so testing in the morning provides the most consistent results for monitoring over time. However, if morning testing isn’t convenient, afternoon testing is acceptable for initial diagnosis. Take your usual medicines – unless your doctor or nurse tells you otherwise, continue taking your regular medications. However, if you’re already taking levothyroxine or other thyroid medication, some doctors prefer you take your dose after your blood test (rather than before) for more accurate results. Check with your GP if uncertain. Stay hydrated – drinking water before your appointment can make the blood draw easier and more comfortable for the nurse. Note any symptoms and their duration – make a list of symptoms you’ve experienced (fatigue, weight changes, mood issues, etc.) and when they started. Share this with your nurse and GP to help interpret your results in clinical context. Bring any previous thyroid test results – if you’ve had thyroid testing before, comparing results over time helps identify trends and monitor disease progression or treatment response. Consider timing if you suspect hyperthyroidism – if you’re experiencing symptoms of overactive thyroid (rapid heartbeat, anxiety, tremors), try to avoid excessive caffeine or stimulants on the day of testing, as these can exacerbate symptoms. Wear comfortable clothing – choose something with sleeves that can be easily rolled up for the blood sample to be taken from your arm. Inform your nurse of relevant medical history – let your nurse know if you have a family history of thyroid disease, are pregnant or planning pregnancy, have other autoimmune conditions, or take medications that affect thyroid function.
If you are unsure about medication timing, have any health conditions that might affect testing, or have any questions about symptoms or preparation, your nurse can answer these during your appointment.
For ongoing monitoring: If you’re already on thyroid medication and having regular monitoring tests, try to have your blood taken at a similar time of day each time (ideally morning) for the most consistent comparison of results over time.
How it Works
Order your test, and then Answer the Questions about why you’re taking that test.
You’re then given instructions on calling the team to book a date and time for a nurse, so they can take your blood sample at your home, workplace or clinic.
Our nurse will then send your sample to our laboratory.
Our skilled laboratory staff conduct your blood tests in a clean and secure environment, ensuring accuracy and reliability.
Each test follows strict protocols to maintain the highest quality standards.
We will email you to inform you that your blood test results are ready.
The email will have a PDF report attached, sent directly to your inbox.
With regular ongoing tests and reports, you can track your results. The reports can be shared with your GP.
Check if you’re improving healthily or where changes could be made.
Other Questions
Clinical Evidence
TSH as frontline thyroid investigation: UK and international guidance recommends TSH (thyroid-stimulating hormone) as the primary test for assessing thyroid function, with Free T4 and Free T3 measured when TSH is abnormal or when monitoring treatment. TSH levels outside the normal range (typically 0.4-4.0 mU/L) indicate hypothyroidism (high TSH) or hyperthyroidism (low TSH).
Source: NICE Thyroid Disease Assessment and Management, American Thyroid Association Guidelines
Free T4 and Free T3 for comprehensive assessment: Free T4 (thyroxine) and Free T3 (triiodothyronine) provide additional diagnostic information beyond TSH alone. Free T3 is particularly important for diagnosing hyperthyroidism and monitoring treatment response, as T3 is the biologically active thyroid hormone.
Source: NHS Gloucestershire Thyroid Function Tests, How to Interpret Thyroid Function Tests – PMC
Thyroid antibody testing for autoimmune disease: Thyroid peroxidase (TPO) antibodies are found in virtually all cases of Hashimoto’s disease and 65% of Graves’ disease cases. Thyroglobulin (TGA) antibodies are present in 80% of Hashimoto’s cases. Antibody testing helps distinguish autoimmune thyroid disease from other causes of thyroid dysfunction and predicts progression to overt hypothyroidism.
Source: Oxford University Hospitals Thyroid Antibodies Testing, Thyroid UK Antibodies Information
Clinical correlation essential for diagnosis: NICE guidance emphasises that thyroid disease diagnosis should never rely on blood test results alone. Your GP or specialist must consider your symptoms, examination findings, medical history, and test results together to make an accurate diagnosis and treatment plan.
Source: NICE Thyroid Disease Guidance
Venous blood sampling for accuracy: Venous blood collection provides sufficient sample volume and consistent quality for laboratory hormone and antibody testing, reducing the risk of sample errors and false results that can occur with finger-prick capillary samples, particularly for thyroid antibody detection.
Source: UK Health Security Agency Laboratory Guidance
Laboratory quality and accreditation: ISO 15189 is the international standard for medical laboratories covering sample handling, testing protocols, and result reporting. Using UKAS ISO 15189-accredited laboratories ensures your thyroid test results are reliable, comparable to NHS standards, and suitable for clinical decision-making.
Source: UKAS Medical Laboratory Accreditation, Royal College of Pathologists ISO 15189 Standards
Frequently Asked Questions
Why Should I Choose A Private Thyroid Blood Test?
A private Thyroid Blood Test gives you fast access to comprehensive testing without NHS waiting times. You receive professional nurse home visits, complete hormone and antibody analysis, and GP-shareable results within 7 days, allowing you to take control of your thyroid health immediately.
What Does A Thyroid Blood Test Check?
A thyroid blood test measures thyroid hormones and/or thyroid antibodies to assess how well your thyroid gland is functioning. Our Standard test measures TSH (thyroid-stimulating hormone), Free T4 (thyroxine), and Free T3 (triiodothyronine). Our Advanced test includes all of these plus TPO and TGA antibodies to detect autoimmune thyroid disease like Hashimoto's or Graves' disease. These tests help diagnose hypothyroidism (underactive thyroid), hyperthyroidism (overactive thyroid), and identify the underlying cause.
Do I Need To Fast Before A Thyroid Blood Test?
No. Thyroid function tests do not require fasting. You can eat and drink normally before your blood test, making this test convenient and easy to fit into your daily routine. Thyroid hormone levels are not affected by food or drink intake.
What Do Abnormal Thyroid Test Results Mean?
High TSH with low Free T4 suggests hypothyroidism (underactive thyroid). Low TSH with high Free T4 and/or Free T3 suggests hyperthyroidism (overactive thyroid). Positive TPO or TGA antibodies indicate autoimmune thyroid disease (Hashimoto's or Graves'). Your GP will interpret your results alongside your symptoms and medical history to confirm a diagnosis and recommend appropriate treatment. Never self-diagnose or start treatment without medical advice.
Should I Choose Standard Or Advanced Thyroid Test?
Choose the Standard test if you're experiencing thyroid symptoms for the first time and want to check hormone levels (TSH, Free T4, Free T3). Choose the Advanced test if you have persistent symptoms despite normal previous results, have a family history of autoimmune disease, are experiencing fertility issues, or want comprehensive testing including antibodies (TPO and TGA) to detect Hashimoto's or Graves' disease. The Advanced test provides a complete picture of thyroid function and autoimmune status.
Can I Use These Results With My NHS GP?
Yes. Your results are provided as a professional PDF laboratory report that you can easily share with your NHS or private GP, endocrinologist, or other healthcare provider. The report includes all thyroid biomarker results, reference ranges, and laboratory accreditation details, meeting the same quality standards as NHS testing. Your GP can use these results to support diagnosis and treatment decisions.
How Long Will My Appointment Take?
The nurse visit typically takes 10–15 minutes. The blood sample itself only takes a few minutes to collect using a venous draw from your arm, with a little extra time for paperwork and answering any questions you may have about the test or thyroid symptoms.
When Will I Get My Results?
Results are typically available within 7 days of your blood sample reaching the laboratory. You'll receive your results by email as a clear PDF report that you can save, print, or share with your GP for discussion and next steps.
What Is The Difference Between TSH, T4, And T3?
TSH (thyroid-stimulating hormone) is produced by your pituitary gland and signals your thyroid to produce hormones. T4 (thyroxine) is the main hormone produced by your thyroid and is converted into T3. T3 (triiodothyronine) is the active form that controls metabolism, energy, and body temperature. Testing all three gives a complete picture of thyroid function. High TSH means your thyroid isn't producing enough hormones (hypothyroidism), while low TSH means it's producing too much (hyperthyroidism).
Can Thyroid Problems Affect Weight?
Yes. Hypothyroidism (underactive thyroid) slows your metabolism, often causing unexplained weight gain, difficulty losing weight, and water retention despite diet and exercise. Hyperthyroidism (overactive thyroid) speeds up metabolism, typically causing unintentional weight loss despite eating normally. If you're experiencing unexplained weight changes, thyroid testing can help identify whether thyroid dysfunction is the cause.
Should I Stop Taking Thyroid Medication Before Testing?
No, never stop taking prescribed thyroid medication without your doctor's advice. If you're already on levothyroxine or other thyroid medication, continue taking it as prescribed. Some doctors recommend taking your medication after your blood test (rather than before) on the day of testing for more accurate results. Check with your GP if you're uncertain about timing.
How Common Are Thyroid Disorders In The UK?
Thyroid disorders affect approximately 1 in 20 people in the UK, with women 5-8 times more likely to develop thyroid problems than men. Hypothyroidism is more common than hyperthyroidism, and autoimmune thyroid disease (Hashimoto's and Graves') accounts for 90% of cases. Many people have undiagnosed thyroid disorders because symptoms develop gradually and are often mistaken for other conditions or ageing.
Can Stress Affect Thyroid Function?
Yes. Chronic stress can disrupt thyroid function and worsen existing thyroid conditions. Stress affects the hypothalamic-pituitary-thyroid axis, potentially triggering or exacerbating hypothyroidism or hyperthyroidism. Stress can also trigger autoimmune thyroid disease flare-ups in susceptible individuals. If you're experiencing chronic stress alongside thyroid symptoms, testing can help identify whether thyroid dysfunction is contributing to your symptoms.
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