was ist tsh wert — which blood markers matter?

TSH (thyroid-stimulating hormone) is a key blood marker for assessing thyroid function. It is produced by the pituitary gland and controls the release of T3 and T4 from the thyroid. Elevated TSH typically indicates hypothyroidism, while low TSH suggests hyperthyroidism. However, TSH alone is insufficient for a complete picture. Essential additional markers include free T3 (fT3), free T4 (fT4), and thyroid antibodies (TPO-Ab, Tg-Ab, TRAb). Reference ranges vary by lab, age, and pregnancy status. Subclinical changes (e.g., mildly elevated TSH with normal fT3/fT4) require careful clinical evaluation, as they may not always need treatment. Factors like biotin supplements, glucocorticoids, and time of day can affect TSH levels. A single TSH measurement from a consumer test is only a screening hint, not a diagnosis. If abnormal, consult an endocrinologist for a full workup including ultrasound and antibody testing.