Thyroid blood tests help figure out how well your thyroid gland is working. TSH helps the thyroid gland know when to make ...

A thyroid-stimulating immunoglobulin (TSI) test is a blood test that can help diagnose Graves’ disease, an autoimmune condition that causes an overactive thyroid. A TSI test measures levels of TSIs in ...

Plus, when to see a doctor.

Accurately diagnosing thyroid function is critical to avoid harms of unnecessary treatment. This study found that age-, sex-, and race-specific reference intervals reclassified nearly half of patients ...