How do I prepare for this test?

Fasting for 8-12 hours before your test (water only) is recommended where glucose, cholesterol or triglyceride accuracy matters. Book your sample between 7:00am and 10:00am. Stay hydrated, and avoid strenuous exercise, heavy meals and supplements including iron, B12, multivitamins and biotin for 48 hours beforehand. Continue any prescribed medication unless your doctor has told you otherwise.

Do I need a doctor's referral?

No referral is needed. You can book directly, and your results are reviewed by a doctor before you receive them. This test is not a diagnosis on its own, so discuss anything unexpected with your GP or a clinician.

T3 Blood Test | From £89 | Nuvivo Health – Nuvivo Health – Private Blood Tests

T3 Blood Test

1 Biomarker | Venous Blood Test | UKAS-accredited laboratory

Total triiodothyronine, the more active of the two main thyroid hormones. Designed for people investigating thyroid symptoms where hormone conversion is in question, this test gives you a clear laboratory result alongside the reference range so you can see exactly where you sit.

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

Doctor's comments are optional on individual markers. Add them for £15.00 at checkout, or your result is issued as a laboratory report showing your value alongside the reference range.

A laboratory result is not a diagnosis. If you have urgent or worrying symptoms, contact your GP or call 111. In an emergency call 999.

£89.00

Taxes included. Shipping calculated at checkout.

Collection method Venous draw at our Livingston clinic Self-arrange professional collection Partner clinic visit (+£35.00) Nurse home visit (+£63.00)

Doctor's comments Laboratory report only Add doctor's comments (+£15.00)

Frequently asked questions

This test measures Triiodothyronine, the most biologically active thyroid hormone. It is usually interpreted alongside TSH and FT4 rather than on its own.

People with palpitations, anxiety, heat intolerance or weight loss where an overactive thyroid is suspected, and those following up an abnormal TSH result.

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

This test requires a venous blood draw, so a finger prick sample is not suitable. You can book at our Livingston clinic, at a partner clinic, or arrange a home visit with one of our nurses.

Results are typically available within approximately 2 working days of your sample reaching the laboratory. Every result is reviewed by a doctor before release and delivered securely to your online account. All testing is carried out in a UKAS-accredited laboratory.