Thyroid
Also known as: Free Thyroxine, Thyroxine test by equilibrium dialysis
If you experience sudden severe symptoms like a very fast or irregular heartbeat, severe anxiety, unexplained weight loss, or extreme fatigue, contact your clinician immediately or seek urgent care.
This test checks the amount of T4 in your blood. T4 is a hormone. This T4 is not stuck to other things. This "free" T4 is the part that works in your body. It helps your body's parts do their jobs right.
Your doctor orders this test to see how your thyroid gland is working. This is especially true if you have signs of a thyroid that is too active or not active enough. The test also helps check if your thyroid medicine is working.
Reference ranges for Free T4 can vary between different laboratories and may also depend on factors like age, sex, pregnancy status, and clinical context. Always discuss your specific results with your healthcare provider.
Clinical Reference
175932200084144Medicare 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.