Thyroid Blood Test

3 Biomarkers | Venous or Capillary Blood Test | CE-marked | UKAS-accredited | Doctor-reviewed results with personalised interpretation.

A thyroid function check measuring TSH, FT4 and FT3. Designed for people investigating tiredness, weight changes, low mood, cold sensitivity or energy changes, this test gives clear, clinically reviewed insight so you can understand your results and know what to do next.

Results are typically available within 2 working days from when your sample reaches the laboratory (excluding weekends and bank holidays).

£45.00

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Choose your sample collection method: Book a venous draw at our Livingston clinic Book a venous draw at home with a nurse +£63 Self-arrange a professional sample collection Partner clinic visit + £35.00 Finger Prick

Free Thyroxine, FT4
Free Triiodothyronine, FT3
Thyroid Stimulating Hormone

Fasting required 8–12 h before the test (water only) recommended for glucose, cholesterol/triglyceride accuracy
Sample timing: between 7:00 AM – 10:00 AM
Stay hydrated; avoid strenuous exercise, heavy meals, and supplements (iron, B12, multivitamins, biotin) for 48 hours prior
Continue prescribed medications unless otherwise directed

Frequently asked questions

It is for adults with symptoms that may indicate a thyroid disorder, such as fatigue, weight change, feeling cold, hair thinning, low mood or palpitations. It provides a core assessment of thyroid function.

Yes. Stop biotin containing supplements, including many hair, skin and nail products and some B complex formulations, for at least 48 hours. Biotin interferes with the laboratory method used for thyroid testing and can produce results that appear falsely high or low.

Take your sample before your daily dose, ideally in the morning, and keep the timing consistent each time you retest. Taking levothyroxine shortly before the test raises measured T4 and makes results difficult to compare.

Fasting is not required. TSH is slightly higher early in the morning, so if you are monitoring an existing thyroid condition, testing at a consistent time makes changes easier to interpret.

This is the core assessment. The Advanced Thyroid Blood Test adds thyroid antibodies and a fuller range of thyroid hormones, which matters if you are investigating an autoimmune cause such as Hashimoto's or Graves' disease.