Free T4 and Free T3

What is Free T4?

Free T4, also known as thyroxine, is a hormone produced by the thyroid gland. It plays a crucial role in our metabolism and energy balance.

Why should you have Free T4 tested?

Measuring Free T4 is useful for assessing thyroid function. It is especially relevant when experiencing symptoms of an overactive or underactive thyroid, such as unexplained weight change, fatigue, or mood swings.

What does it indicate?

Free T4 levels help in evaluating thyroid function. It provides insight into how well the thyroid gland produces and secretes hormones.

What does a high Free T4 level mean?

A high level of Free T4 may indicate hyperthyroidism, a condition in which the thyroid gland produces too much hormone. This can lead to symptoms such as weight loss, nervousness, and a rapid heartbeat.

What does a low Free T4 level mean?

A low level of Free T4 may indicate hypothyroidism, where the thyroid gland does not produce enough hormone. This can lead to symptoms such as weight gain, fatigue, and cold intolerance.

What is Free T3?

Free T3, or triiodothyronine, is another important hormone produced by the thyroid gland. It is even more active than T4 and has a strong influence on metabolism.

Why should you have Free T3 tested?

Testing for Free T3 is useful for a more in-depth evaluation of thyroid function, especially if symptoms or results from other thyroid function tests are contradictory or unclear.

What does it indicate?

Free T3 levels provide an accurate picture of thyroid activity and are particularly useful in diagnosing hyperthyroidism or in cases where T4 levels are normal but symptoms of a thyroid disorder persist.

What does a high Free T3 level mean?

High levels of Free T3 may indicate hyperthyroidism, which can result in symptoms such as increased heart rate, anxiety, and sleep problems.

What does a low Free T3 level mean?

Low levels of Free T3 may indicate hypothyroidism, with possible symptoms such as fatigue, depression, and a sluggish metabolism.