Thyroid Function

The thyroid plays a role in regulating metabolism, energy levels, and body temperature. Measuring TSH alone may not capture the full picture, as Free T4 and Free T3 levels can vary independently. This panel includes all three markers so that production and conversion can both be assessed.

• Men who experience persistent fatigue, unexplained weight changes, or sensitivity to cold and want to rule out thyroid-related factors
• Those who have a family history of thyroid conditions
• Men who want a baseline measurement of thyroid function for future comparison

• TSH (mu/l, ref: 0.27-4.2): Thyroid-Stimulating Hormone, produced by the pituitary gland to signal the thyroid. Elevated or suppressed TSH may indicate the thyroid is under- or overproducing hormones.
• Free T4 (pmol/l, ref: 12-22): the unbound, active form of thyroxine. T4 is the primary hormone produced by the thyroid gland.
• Free T3 (pmol/l, ref: 3.1-6.8): the unbound form of triiodothyronine, largely converted from T4 in peripheral tissues. T3 is considered the more metabolically active thyroid hormone.

Together, these three markers may help indicate whether the thyroid is producing hormones at expected levels and whether the body is converting T4 to T3 adequately. For instance, TSH could be elevated while Free T4 remains within range, which might suggest the pituitary is working harder to maintain normal output. Conversely, low TSH with elevated Free T4 or Free T3 could point toward overproduction. The interplay between these markers provides more context than any single value alone.

A blood sample is drawn at a certified sample point (afnamepunt). There are over 750 locations across the Netherlands. After placing your order, you can select a location and time that works for you. The appointment typically takes around 10 to 15 minutes.

This test may be useful when experiencing symptoms such as unexplained fatigue, changes in weight, difficulty concentrating, or mood fluctuations that could be associated with thyroid function. It can also serve as a reference point for men who want to track thyroid parameters over time.

Results are presented with reference ranges for each marker. Values outside these ranges do not automatically indicate a clinical condition; they provide data points that may warrant further evaluation. A healthcare provider can help interpret the results in the context of your symptoms and medical history.

Your results are typically available within a few business days in your personal dashboard. The report includes measured values alongside reference ranges. If any values fall outside the expected range, or if you have questions, consider reviewing the results with a healthcare provider.