1004. Thyroid stimulating hormone (TSH)

Thyroid-stimulating hormone (TSH, TSH hormone, or thyrotropin) is a hormone that plays a key role in regulating thyroid function. It controls the production of thyroxine (T4) and triiodothyronine (T3), which influence metabolism, energy balance, the cardiovascular and nervous systems, and other organs and systems.

Thyroid-stimulating hormone is measured using a modern, highly sensitive immunoassay with electrochemiluminescence detection (ECLIA), allowing for the detection of even very low levels. This can be important in selecting treatment and further monitoring of this hormone in people with hyperthyroidism and other pathological conditions.

This method is also biotin-independent – biotin intake does not affect the test results, so the analysis can be performed without discontinuing biotin.

A blood test for TSH is a basic test for assessing thyroid function, as it can detect even minor changes in its function. For a more complete assessment of thyroid function, TSH tests are often ordered along with free T4 and T3 measurements. This helps to more accurately interpret the results and identify potential abnormalities.

An examination is advisable in the following cases:

• in the presence of symptoms that may indicate thyroid dysfunction (fatigue, weight changes, palpitations, dry skin, hair loss);
• if nodules or changes in the size of the thyroid gland are detected;
• when planning a pregnancy and during pregnancy – TSH levels in pregnant women are important for the healthy course of pregnancy and fetal development;
• in cases of diagnosed infertility or menstrual irregularities;
• to monitor treatment for thyroid disease;
• as part of preventive examinations.

• Venous blood

In order to exclude factors that may affect the test results, we recommend to follow the preparation rules: