Free T3
$32.20
Plus a $12 blood draw fee, charged once per order. Free when your order includes a bundle.
- Sample
- Blood draw
- Preparation
- No fasting needed.
- Results in
- 2-4 business days after your sample reaches the lab
Tests are ordered by an independent licensed physician. This service does not replace care from your own doctor. Talk with a healthcare professional about your results.
This test measures free T3, the most biologically active thyroid hormone.
It’s often ordered alongside TSH and free T4 when thyroid symptoms persist despite a normal TSH. If you take biotin supplements, ask your doctor whether to pause them before your draw — biotin can interfere with this kind of test.