Can medication affect thyroid function test results?

Yes, certain medications can affect thyroid function test results. Medications like thyroid hormone replacements (levothyroxine), beta-blockers, corticosteroids, and lithium can alter TSH, T3, and T4 levels. Other drugs, such as estrogen-containing birth control or anti-thyroid medications, can also interfere with your test results. It’s essential to inform your healthcare provider about any medications you are taking before the test. Your doctor may advise adjusting the timing of your medication or testing at specific intervals to ensure the most accurate results, especially if you’re undergoing treatment for thyroid-related issues.