In short
- FT4 (free thyroxine) is a thyroid hormone that helps regulate metabolism, energy levels and body temperature.
- The amount of FT4 in the blood provides important information about thyroid function.
- A high or low FT4 level may be associated with an overactive or underactive thyroid.
- Abnormal thyroid hormone levels can cause symptoms such as fatigue, changes in weight, palpitations or changes in mood.
- An FT4 test is often combined with TSH and sometimes FT3 to provide a more complete picture of thyroid function.
- Thyroid disorders do not always cause noticeable symptoms immediately and may develop gradually.
- A finger-prick blood test can accurately measure and assess your FT4 level.
- Would you like more insight into how your thyroid is functioning? An FT4 test can help identify possible abnormalities.
What is the function of the thyroid gland?
The thyroid is a small organ in your neck that produces hormones. These hormones, including FT4 (free thyroxine), regulate how quickly your body uses energy and how other organs function. The thyroid therefore helps regulate your metabolism, energy levels, heart rate and body temperature.
What are the symptoms of abnormal thyroid function?
If your thyroid is underactive, you may feel tired, gain weight, feel cold, develop dry skin or experience constipation. If your thyroid is overactive, you may lose weight, sweat more, have a rapid heartbeat or feel restless. Hair loss and mood changes can also occur.
Where is the thyroid gland located in the body?
The thyroid is located at the front of your neck, just below your Adam’s apple. You usually cannot see or feel it unless it is enlarged.
Are thyroid problems common?
Thyroid problems are relatively common, particularly among women and older adults. In the Netherlands, approximately 1 in 10 people develop a thyroid problem at some point in their lives.
Can you develop thyroid problems later in life?
Yes, thyroid problems can develop at any age, but they become more common as you get older. Women can also sometimes develop thyroid problems after pregnancy.
What can affect thyroid function?
Various factors can affect thyroid function, including genetics, certain conditions (such as autoimmune diseases), medications and, in some cases, insufficient iodine intake.
How can you support a healthy thyroid?
A healthy lifestyle can help support normal thyroid function. Make sure you get enough iodine through your diet, for example from bread or oily sea fish, eat a varied diet, exercise regularly and try to reduce stress. Do not smoke, as smoking can affect thyroid function.
Can thyroid problems be treated?
Yes, thyroid problems can usually be treated effectively. An underactive thyroid is often treated with medication that replaces thyroid hormone. An overactive thyroid can also be treated with medication, and in some cases other treatments such as surgery or radioactive iodine may be used. It is important to determine the appropriate treatment together with your doctor.
This article is for informational purposes only and is not a substitute for medical advice from a doctor. If your symptoms persist or you are concerned, always contact your doctor.
