Total T4 – What Do Your Numbers Mean?
Have you had your Total T4 level measured and are unsure what the numbers mean? Here's a clear explanation of the normal range, what high or low levels can indicate, and when it makes sense to get tested.
What is the normal range for Total T4?
What is the normal range for Total T4?
The normal range for Total T4 in adults over 18 years is 60-140 nmol/L. This range can vary depending on the laboratory's analysis methods and geographical differences. For children and adolescents under 18 years, the reference values are typically higher, for example, 68-200 nmol/L for children between 1 month and 6 years. It is important to note that factors such as pregnancy, medication, and individual variations can affect the levels. Being close to the limit values can indicate early disturbances in metabolism, which should be assessed by a doctor.
What does a low level mean?
A low Total T4 level can indicate hypothyroidism, a condition where the thyroid gland produces insufficient amounts of thyroid hormone. Symptoms can include fatigue, weight gain, cold sensitivity, dry skin, and hair loss. Common causes are iodine deficiency, autoimmune diseases such as Hashimoto's thyroiditis, or side effects from medication. Pregnant women and individuals with previous thyroid diseases are particularly at risk. If you experience symptoms of low T4, you should contact a doctor for further investigations and possible treatment, which often involves supplementation with synthetic thyroxine.
What does a high level mean?
A high Total T4 level can be a sign of hyperthyroidism, where the thyroid gland produces too much thyroid hormone. Symptoms include weight loss, palpitations, nervousness, sweating, and heat intolerance. Causes can be Graves' disease, nodular goiter, or overdose of thyroxine. It is important to seek medical attention if hyperthyroidism is suspected, as the condition can lead to serious complications such as heart problems. Treatment depends on the cause and may include medication, radioactive iodine, or surgery.
Get Your Total T4 Level Tested
At Celto, you can order a Total T4 blood test directly online – without a referral from your doctor and without long waiting times. We have over 34 blood sample collection points at public hospitals throughout Denmark, and your samples are analyzed at the same accredited laboratories used by the rest of the healthcare system. You will receive your results directly on sundhed.dk, just like all other blood tests from the public system.
How it Works
When you order a blood test from Celto, you choose which markers you want tested – no doctor's referral necessary. After your purchase, you will receive an email with a link to our booking system, where you choose a time and location. The blood sample itself is taken by authorized healthcare personnel and typically only takes a few minutes.
Where You Can Get Tested
Celto has over 34 blood sample collection points at public hospitals and clinics throughout Denmark. You choose the location that suits you best among our partners, and there are typically available times within a few days. Find your nearest blood sample collection point →
How You Get Your Results
Your blood samples are analyzed at the same laboratories used by your own doctor and the rest of the healthcare system, with the exact same quality and the exact same tests. You will receive your results directly on sundhed.dk within a few business days, and Celto will also send an easy-to-understand review of your values so you know what the numbers mean.