TSH (Thyroid Stimulating Hormone) Test

Is a slightly high TSH always a concern?

Not necessarily — mildly elevated TSH with otherwise normal thyroid hormones is common and doesn't always require treatment. Your doctor will weigh your symptoms and repeat testing before deciding.

Why is TSH tested before T3 and T4?

TSH usually shifts before actual thyroid hormone levels do, making it a more sensitive early indicator, which is why it's typically used as the first screening step.

Can TSH levels change during the day?

Yes, TSH follows a mild daily rhythm, generally peaking at night and dipping slightly in the late afternoon, though this variation is usually small enough not to affect clinical interpretation.