Schilddrüsen-Profil (Thyroid Panel TSH+fT3+fT4)

A comprehensive thyroid function panel measuring TSH alongside free T3 (fT3) and free T4 (fT4). While TSH indicates whether the pituitary perceives thyroid output as adequate, the free hormone levels reveal the actual circulating concentrations of active thyroid hormones. This three-marker combination distinguishes between primary and secondary thyroid disorders and quantifies the severity of any dysfunction detected.

The full thyroid panel provides the complete picture that a TSH-only test cannot. TSH tells you the pituitary's opinion of thyroid function, but free T3 and free T4 reveal the reality at the tissue level. Discordant results between TSH and the free hormones point to specific conditions: a high TSH with low fT4 confirms primary hypothyroidism, while a normal TSH with low fT3 may indicate a conversion problem where the body fails to activate the prohormone T4 into the metabolically active T3. Free T3 is particularly relevant for patients experiencing persistent symptoms despite seemingly normal TSH levels. T3 drives the majority of thyroid hormone effects at the cellular level — regulating metabolic rate, body temperature, heart rate, and cognitive function. Some individuals convert T4 to T3 inefficiently due to selenium deficiency, chronic stress, or genetic variation in deiodinase enzymes, a situation that TSH alone cannot detect. At SYNLAB München Zentrum, all three markers are measured from a single blood draw using automated immunoassay platforms. No fasting is strictly required, although morning collection provides the most consistent baseline values. Results are typically available within one to two working days. This panel is the standard follow-up when TSH screening yields abnormal results, and it serves as the preferred monitoring panel for patients on thyroid hormone replacement therapy.