was ist ein normaler schilddrüsenwert — which blood markers matter?

The question 'what is a normal thyroid value' is common, but there is no single number. The primary screening marker is **TSH** (thyroid-stimulating hormone). A TSH between 0.4 and 4.0 mIU/L is generally considered euthyroid (normal), though some labs use narrower ranges. If TSH is abnormal, **free T4** (fT4, normal ~0.8–1.8 ng/dL) and **free T3** (fT3, normal ~2.0–4.4 pg/mL) are measured. For autoimmune thyroid conditions (Hashimoto’s, Graves’), **TPO antibodies**, **thyroglobulin antibodies**, and **TSH receptor antibodies** (TRAK) are relevant. Important caveats: normal ranges vary by laboratory, age, pregnancy, and assay method. A single test is insufficient – clinical context and trends matter. Factors like biotin supplements, time of day, and acute illness can alter results. Consumer DNA tests for thyroid-related variants (e.g., in DIO2 or TSHR) are not validated for clinical decision-making. Always consult a physician for interpretation and follow-up.