TSH – what do your levels mean?
Have you had your TSH levels 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 TSH?
What is the normal range for TSH?
The normal range for TSH (thyroid-stimulating hormone) varies depending on age, gender, and laboratory methods. For adults, the reference interval is typically between 0.3 and 4.5 mIU/L. In children and infants, values can be higher, for example, 0.7-20.0 mIU/L for newborns. Pregnant women also have specific reference intervals, where TSH in the first trimester can be as low as 0.02 mIU/L, while it rises in the second and third trimesters. Variations can also occur between laboratories, so it is always recommended to consult the local laboratory's reference values. Being close to the limit values can indicate incipient disturbances in thyroid function and should be assessed by a doctor.
What does a low level mean?
A low TSH level may indicate hyperthyroidism, where the thyroid gland produces too many thyroid hormones. Symptoms can include nervousness, weight loss, heart palpitations, sweating, and sleep disturbances. Causes can include Graves' disease, nodular goiter, or overdose of thyroid medication. Particularly vulnerable groups include women and individuals with a family history of thyroid diseases. If TSH is low, you should contact a doctor for further investigations, which may include measuring T3 and T4 and antibodies to identify the cause.
What does a high level mean?
A high TSH level may indicate hypothyroidism, where the thyroid gland produces too few thyroid hormones. Symptoms include fatigue, weight gain, cold intolerance, dry skin, and hair loss. Common causes are Hashimoto's disease, iodine deficiency, or side effects from medications such as lithium. Pregnant and elderly individuals are particularly vulnerable. With elevated TSH, you should contact a doctor to have your T4 level and possibly antibodies measured. Treatment may include thyroid hormones, and it is important to seek medical attention quickly, especially if symptoms are pronounced.
Get your TSH level tested
At Celto, you can order a blood test for TSH directly online – without a referral from your doctor and without long waiting times. We have over 34 sample collection sites 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 to have tested – no doctor's referral necessary. After your purchase, you will receive an email with a link to our booking system, where you choose time and location. The blood sample itself is taken by authorized healthcare personnel and typically takes only a few minutes.
Where you can get tested
Celto has over 34 sample collection sites at public hospitals and clinics throughout Denmark. You choose the location that suits you best among our partners, and there are typically available appointments within a few days. Find your nearest sample collection site →
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 same tests. You will receive your results directly on sundhed.dk within a few working days, and Celto will also send an easy-to-understand review of your values so you know what the numbers mean.