Triiodothyronine (T3) is an active thyroid hormone that plays a vital role in metabolism regulation. The thyroid T3 Blood test checks T3 levels in your blood in order to determine whether your thyroid is functioning properly.

Purpose of Testing for T3

A T3 blood test is commonly performed to:

• Identify symptoms that may suggest a thyroid issue
• Gain a comprehensive understanding of thyroid function and overall health
• Evaluate the effectiveness of thyroid medication

How to Prepare for Your T3 Blood Test

• Take plenty of water 24 hours before your appointment to make the blood extraction easier.
• Choose loose-fitting clothes that provide easy access to your arms and hands.
• If you take anticoagulants, it’s best to take them after your test. But if this is impossible, you can take them before.

If you fear needles, be sure to inform your GP so they will help you stay calm and ensure a quick, comfortable experience.