Thyroid Test TSH, fT3 & fT4
Understand your metabolism with a comprehensive thyroid test. This home blood test thyroid kit measures TSH, free T3, and free T4 to assess thyroid function.
Product details: EUR 74.99 — InStock — SKU EU14 — GetTested
About this test
Key Benefits
Measures key thyroid hormones: TSH, fT3, fT4
Provides insight into metabolism and energy levels
Helps identify signs of hypothyroidism or hyperthyroidism
Simple at-home finger-prick blood test
Supports understanding of hormonal balance
What This Test Measures
TSH (Thyroid Stimulating Hormone)
Free T3 (fT3)
Free T4 (fT4)
About Thyroid Function
The thyroid works through a feedback system involving TSH, T4, and T3. TSH signals the thyroid to produce hormones, while T4 is converted into the active hormone T3, which regulates metabolism and energy.
Imbalances in these hormones may affect weight, mood, energy levels, and overall health.
Symptoms of Imbalance
Low thyroid function (hypothyroidism):
Fatigue
Weight gain
Cold sensitivity
Low mood
Dry skin and hair
High thyroid function (hyperthyroidism):
Fatigue
Weight loss
Heat intolerance
Increased heart rate
Nervousness
How It Works
Order your test kit online and collect a finger-prick blood sample at home. The sample is then sent to the laboratory for analysis, and you receive your results digitally in a clear and easy-to-understand format.
Sample Collection
The sample is collected using a simple finger-prick blood test (DBS) at home. You collect a few drops of blood on the card and send it to the lab for analysis. The method is quick and easy to perform.
ISO-Certified Laboratory
Your sample is analyzed in an ISO-certified laboratory using Electro Chemiluminescence (ECLIA), a highly sensitive and reliable method for hormone analysis, ensuring accurate and dependable results.
Biomarkers included
- TSH: Thyroid-Stimulating Hormone (TSH), also known as thyrotropin, is a hormone produced by the pituitary gland. It plays a crucial role in regulating thyroid function by stimulating the thyroid gland to produce and release thyroid hormones (T3 and T4), which are vital for metabolism, growth, and development. Measuring TSH levels is a primary way to assess thyroid gland activity and diagnose thyroid di
- Free T3 (fT3): Free triiodothyronine (fT3) is the unbound, biologically active form of the thyroid hormone T3. T3 plays a central role in regulating metabolic rate, energy production, temperature regulation, and many aspects of growth and tissue function. Measuring fT3 reflects the portion of T3 that is available to tissues, independent of variations in thyroid-binding proteins. fT3 is typically interpreted toge
- Free T4 (fT4): Free thyroxine (fT4) is the unbound fraction of the thyroid hormone T4 circulating in the blood. Because only the free hormone can enter cells, fT4 reflects the amount of thyroid hormone available to tissues and is a key marker of thyroid function. fT4 is commonly measured to help evaluate and monitor thyroid disorders—levels may be elevated in hyperthyroidism and reduced in hypothyroidism. It is
How to prepare
Collect the blood sample in the morning before breakfast. If you take biotin supplements, stop taking them 72 hours before collection.
Frequently asked questions
How does it work? / When do I get my results?
1. Order and receive your kit. 2. Perform the test. 3. Send a sample at the beginning of the week (to avoid delays). 4. Results digitally in 10–15 business days.
When is the best time to take the thyroid test?
The best time to collect your blood sample is in the morning before eating. Avoid taking supplements containing biotin (Vitamin B7) for at least 72 hours before the test, as high doses of biotin can interfere with thyroid lab results.
Why does this test measure three different markers rather than just TSH?
TSH is the signaling hormone from the brain, while T4 is the storage hormone and T3 is the active hormone. Measuring all three is crucial because some individuals may have normal TSH levels but struggle with converting T4 into the active T3 hormone, which can still cause symptoms of an underactive thyroid.
Who should consider taking a thyroid function test?
Common signs of thyroid imbalance include unexplained weight gain or loss, chronic fatigue, sensitivity to cold or heat, thinning hair, dry skin, and mood changes such as anxiety or depression.
Customer reviews
4.6/5 (5)
- 4/5 — The finger prick was a bit tricky but the kit worked well.
- 5/5 — Simple process and accurate results.
- 5/5 — Super convenient way to check my levels without a doctor's visit, results were easy to read.
- 5/5 — Fast shipping and straightforward instructions.
- 4/5 — Happy to see fT3 and fT4 included instead of just TSH. It took about two weeks for the results but the data was worth it.