Free T4 (fT4)
Free Thyroxine (fT4) is a key thyroid hormone produced by the thyroid gland, playing an essential role in metabolism, brain development, and bone health. It serves as the precursor to the active hormone fT3. Measuring fT4 provides insight into thyroid function by reflecting the hormone directly released and available for conversion.
Description
Testing fT4 is beneficial for those with thyroid dysfunction symptoms or those undergoing thyroid treatment. It’s also advised for patients with pituitary gland disorders.
Imbalances in fT4 can lead to symptoms like fatigue, depression, weight changes, hair loss, and changes in heart rate or body temperature.
Free T4 is crucial as it represents the hormone directly produced by the thyroid, impacting bodily functions. Its levels help diagnose thyroid conditions and guide treatment decisions.
High fT4 levels may indicate hyperthyroidism, causing symptoms like anxiety and weight loss. Low fT4 levels can point to hypothyroidism, leading to fatigue and weight gain.
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