T3 Free Test

The free T3 test checks the T3 free blood level.

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T3 Free Test FAQ

What is a T3 free test?

A free T3 test measures the T3 free blood level.

Why is a T3 free test important?

An abnormal T3 test can help confirm hyperthyroidism and is also used for tracking an ongoing thyroid issue.

What type of specimen will I submit?

This T3 Free Test is a blood test.

Do I need to fast to take this test?

Fasting is not necessary.

How long does it take to get test results?

It typically takes 4 business days or less.

Accesa Labs does not provide medical advice, diagnosis or treatment. All users should consult with a medical provider for specific health concerns.

Last updated on June 1, 2018

T3 Free Test for $59

T3 Free Blood Test - More Information

The T3 free test, also known as a T3 free blood test and a free T3 lab test, measures the free T3 blood level.

T3, or triiodothyronine, is a hormone produced by the thyroid gland to help with metabolism. The "free" component of the T3 test represents triiodothyronine floating unbound to proteins in the blood. To get through the blood, most triiodothyronine is transported by a carrier protein while the free T3 (a small percentage of the total) floats freely. At the cellular level, free T3 is readily accessible by cells (i.e. bioavailable) while bound T3 takes longer to be absorbed because it first has to detach from the carrier protein. As a result, the free T3 blood level is often ordered in conjunction with the total T3 level to get a more complete picture of one's T3 hormone status.

To get a T3 free test near you, order online and get tested at Quest Diagnostics. Once the T3 free lab results are ready, they will be available for download. As can be seen on the sample T3 free lab report, the T3 free blood level is reported as a numerical value and can be compared against the reference range provided by the lab.

Some people are interested in the T3 free test as part of a more comprehensive evaluation for a more complex thyroid condition. As a result, the free T3 blood test is also part of specialized thyroid panels such as the Graves' disease test panel and the Hashimoto's test panel. The T3 free test is also tested in the hyperthyroidism test panel and as part of the thyroid comprehensive test panel.

T3 Free Test at Guaranteed Prices.
Our T3 Free Test price includes the following:
  • A doctor's lab order
  • 24 / 7 order processing
  • Access to 1000+ Quest labs
How It Works
1. Order Online
No separate office visit required.
2. Visit Lab
Get tested at a lab near me.
3. Receive Results
Get electronic results securely.