À La Carte Tests
Triiodothyronine (T3), Free
Measures free T3, a thyroid hormone, to help evaluate thyroid function.
What is included?
About this test
This blood test measures free triiodothyronine (T3), the portion of T3 that is not attached to proteins in your blood. Results can be reviewed alongside TSH and free T4 to help evaluate thyroid function.
Collection and results
Collection is currently through participating Labcorp locations only. Wait for your requisition and collection instructions before visiting. Results are delivered through an approved communication method; timing depends on the tests ordered. Contact Rios Click Labs if you need help with result access.
Ordering labs in Houston · Find a collection location
How it works
- Add this test or panel to your cart and complete checkout online.
- Rios Click Labs / Rios Healthcare reviews and processes your order.
- You receive collection instructions before visiting a participating Labcorp location. Collection is currently through Labcorp only.
- Your results are returned through an approved communication method.
Lab testing does not replace emergency care, diagnosis, treatment, or ongoing medical management. If you have urgent symptoms or a medical emergency, seek prompt medical care.