レボチロキシンを服用している人と甲状腺ホルモン補充を行っていない人で、循環している遊離サイロキシン（FT4）と甲状腺刺激ホルモン（TSH）レベルの関係は非常に異なる。

Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

1. 1Age-specific reference intervals for TSH and FT4 to optimize diagnosis of thyroid disease2024
2. 2Circulating tsh levels are more stable in patients with hypothyroidism treated with liquid L-T42024
3. 3Taking nothing for granted- Levothyroxine formulation2024
4. 4Analysis of thyroid stimulating immunoglobulins vs conventional TSH-receptor antibodies in clinical practice2024
5. 5Real-life levothyroxine intake with possible restriction of absorption in thyroid cancer patients2024