Free T3 (fT3)

Free Triiodothyronine (fT3) is one of the two primary thyroid hormones, playing a crucial role in regulating metabolism, heart rate, and body temperature. Unlike total T3, fT3 represents the unbound hormone available for immediate use by the body, making it a critical indicator of thyroid function....

Free T3 (fT3)

Who would benefit from testing their fT3 levels?

Individuals with symptoms of thyroid imbalance, such as fatigue, weight changes, or mood swings, should test their fT3. It’s also crucial for those being treated for thyroid disorders to monitor treatment effectiveness.

What are symptoms of low or high fT3?

Imbalanced fT3 can cause symptoms like unexpected weight loss or gain, heart rate irregularities, temperature sensitivity, anxiety, and fatigue.

How does free T3 differ from total T3 in thyroid testing?

Free T3 measures the unbound, active form of the hormone, while Total T3 includes both bound and unbound hormone. Free T3 provides a more accurate picture of the hormone readily available for use by the body.

What do abnormal free T3 levels indicate?

High fT3 levels can indicate hyperthyroidism, while low levels may suggest hypothyroidism. It’s important in understanding thyroid gland activity and overall metabolism.

Test(s) that measure/test for Free T3 (fT3)

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