• Free T3
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Free T3

Free T3

$35.00
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The Free T3 test measures the level of free triiodothyronine (T3), a hormone produced by the thyroid gland that plays a significant role in regulating metabolism and energy levels. Unlike total T3, this test focuses specifically on the unbound form of the hormone, which is biologically active. Abnormal Free T3 levels can indicate thyroid dysfunction, impacting energy, weight, and mood. By providing insight into your thyroid hormone status, this test helps you understand your body's metabolic processes and can be a vital part of managing thyroid health.

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About This Test

Reason to Check It

"An extremelycommon cause of low energy is thyroid disease.  In fact, it is often misdiagnosed as depression. In response to brain signaling, the thyroid secretes thyroid hormone.  The active form of thyroid hormone is called free T3.  It's this hormone that has effects on every cell of the body, promoting optimal metabolism and function." - Dr. Alan Hopkins

Test Preparation

  • No special preparation is required before your sample collection.


Please Note: We recommend overnight fasting and an early morning blood draw for all tests, even if no special preparation is required. Remember, it is OK to drink plenty of water. Drinking water helps hydrate you and makes it easier for the phlebotomist to obtain your blood sample.

Test Type and Method

Test Type:

  • Blood


Test Method:

  • In-person Blood Draw

Post-Test Notes

  • Once your specimen is collected, test results are typically processed and available within a few business days. Processing times may vary depending on the test. Your results will be delivered in a clear, easy-to-understand report. If any values fall outside the expected range, you may receive a follow-up call from an independent healthcare coordinator.

Lab Testing is Simple, Fast, and Convenient

Choose the Individual Test or Lab Panel that suits your health needs. You’ll receive your lab requisition within 24 hours. Visit any of the 3,000+ Quest Diagnostics centers using the button below. Once your sample is collected, your results will be securely delivered via email within 7–10 days.

View Quest Draw Locations

Lab Testing is Simple, Fast, and Convenient

Choose the Individual Test or Lab Panel that suits your health needs. You’ll receive your lab requisition within 24 hours. Visit any of the 3,000+ Quest Diagnostics centers using the button below. Once your sample is collected, your results will be securely delivered via email within 7–10 days.

View Quest Draw Locations