Thyroid
Also known as: FT3
If you experience sudden and severe symptoms like a very fast heartbeat, extreme anxiety, confusion, or sudden weakness, seek urgent medical care. No common urgent flag from this test alone.
The Free T3 test checks how much active thyroid hormone is in your blood. This hormone is not stuck to proteins. It is the part your body can use right away.
Your doctor might order this test to see if your thyroid gland is too active. They may also use it to check on your thyroid if you already have a thyroid problem. Sometimes, this test is ordered if other thyroid tests, like TSH or T4, show results that are not normal.
Reference ranges for Free T3 can vary depending on the lab that performs the test. Your doctor will interpret your results based on these ranges and your overall health.
Clinical Reference
175932200082670Medicare covers for hormonal evaluation
Educational purposes only — This information is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your lab results with your healthcare provider.