1,25-dihydroxyvitamin D (calcitriol)
This test measures 1,25-dihydroxyvitamin D, the biologically active form of vitamin D. It is used to investigate calcium imbalance, kidney disease and...
Thyroid Health
49.00
This test evaluates thyroid hormone balance and autoimmune thyroid activity. It helps detect both underactive and overactive thyroid disorders.
Turnaround time
1-2 days
Biomarkers count
5
Same-Day Appointments
UKAS Accredited Labs
Book your test
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 Health
What is a Thyroid Health Test?
The Thyroid Health Test is a comprehensive blood panel used to evaluate thyroid gland function and identify autoimmune thyroid conditions. The thyroid plays a key role in regulating metabolism, energy levels, temperature control, and hormone balance.
This profile includes:
• Thyroid Stimulating Hormone (TSH)
• Free Thyroxine (Free T4)
• Free Tri-iodothyronine (Free T3)
• Anti-Thyroglobulin Antibodies (Anti-Tg)
• Anti-Thyroid Peroxidase Antibodies (Anti-TPO)
TSH measures how strongly the brain is stimulating the thyroid gland, while Free T4 and Free T3 represent active thyroid hormones circulating in the body. Thyroid antibodies help detect autoimmune thyroid diseases such as Hashimoto’s thyroiditis or Graves’ disease.
This combination provides a full overview of thyroid activity and immune involvement.
Why do I need a Thyroid Health Test?
Thyroid disorders are common and often produce vague symptoms that are easily mistaken for stress, ageing, or lifestyle factors. Many people live with thyroid imbalance for years before diagnosis.
Testing is useful when symptoms or risk factors suggest thyroid dysfunction.
Reasons for testing include:
• Persistent fatigue or low energy
• Unexplained weight gain or weight loss
• Hair thinning or hair loss
• Feeling unusually cold or hot
• Anxiety or mood changes
• Heart palpitations
• Sleep disturbance
• Irregular menstrual cycles
• Fertility concerns
• Family history of thyroid disease
Early detection allows effective treatment and prevents long-term complications.
Benefits of the test
1. Detects underactive thyroid (hypothyroidism)
Identifies reduced hormone production causing fatigue and weight gain.
2. Detects overactive thyroid (hyperthyroidism)
Helps diagnose excessive hormone production causing anxiety and weight loss.
3. Identifies autoimmune thyroid disease
Antibody testing detects Hashimoto’s and Graves’ disease.
4. Evaluates unexplained fatigue
Thyroid imbalance is a common hidden cause of low energy.
5. Supports fertility and menstrual health assessment
Thyroid hormones influence reproductive health.
6. Monitors thyroid treatment
Helps adjust thyroid medication doses correctly.
7. Detects early thyroid imbalance
Changes may appear in blood tests before severe symptoms develop.
8. Provides comprehensive thyroid overview
Combining hormone and antibody testing improves diagnostic clarity.
Expanded benefit explanation
Thyroid imbalance affects nearly every organ system and can significantly impact quality of life. A full thyroid panel allows earlier diagnosis and treatment, preventing complications such as heart problems, fertility issues, and metabolic disturbances.
Step-by-step — How testing works
We offer two UK-wide testing options:
Clinic testing
• Choose your nearest UK clinic
• Attend your appointment
• Blood sample collected by clinician
• Sample analysed in laboratory
• Results securely returned
Home or hotel visit (+£60)
• Qualified phlebotomist visits your home, office, or hotel
• Blood sample collected safely on-site
• No need to travel
• Sample transported securely to laboratory
• Results delivered confidentially
Both options are available across the UK.
Your results explained
Low levels
Low thyroid hormone levels may indicate an underactive thyroid.
Typical UK reference ranges:
• TSH: 0.4–4.0 mIU/L
• Free T4: 9–24 pmol/L
• Free T3: 3.1–6.8 pmol/L
• Anti-TPO & Anti-Tg: Negative or very low levels expected
Low Free T4 or Free T3 with elevated TSH usually suggests hypothyroidism.
Normal levels
Hormone levels and antibodies fall within expected ranges.
Interpretation:
Thyroid function appears normal, and symptoms may relate to other causes.
High levels
High thyroid hormone levels or positive antibodies may indicate thyroid overactivity or autoimmune disease.
Possible findings:
• Low TSH with high Free T4 or Free T3 suggesting hyperthyroidism
• Elevated Anti-TPO or Anti-Tg indicating autoimmune thyroid disease
Interpretation:
Further medical evaluation or endocrinology referral may be required.
How It Works
Simple steps to get your results
1
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
Fatigue, weight changes, hair loss, mood changes, and temperature sensitivity.
Fasting is not usually required.
Yes, especially in overactive thyroid conditions.
Underactive thyroid commonly contributes to weight gain.
They indicate immune attack on the thyroid gland.
Yes, genetic risk is common.
Usually every 6–12 months or as advised.
Yes, thyroid function changes during pregnancy.
Yes, both underactive and overactive thyroid can affect fertility.
Treatment depends on symptoms and hormone levels and is decided by a doctor.
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