TSH Schilddrüse: which blood markers matter?

The primary screening marker for thyroid function is TSH (thyroid-stimulating hormone). However, an abnormal TSH alone is insufficient for a full assessment. Clinically relevant blood markers include: free T4 (fT4) and free T3 (fT3), which reflect the actual available thyroid hormones. Autoantibodies such as anti-TPO (thyroid peroxidase) and anti-Tg (thyroglobulin) indicate autoimmune causes (Hashimoto's thyroiditis). For suspected Graves' disease, TRAb (TSH receptor antibodies) is measured. Additional markers like thyroglobulin or calcitonin are used in specific contexts (e.g., cancer follow-up). Importantly, MyBody-X analyzes genetic variants that may be associated with thyroid function (e.g., in TSHR, PDE8B genes), but it does not measure current hormone levels. A blood test ordered by a physician is essential for clinical evaluation. The evidence for these blood markers is strong (guidelines, clinical trials).