Chapter 01 · The tests
What a thyroid panel looks at
The thyroid is a small gland that sets your metabolic pace. The first-line test is TSH, the pituitary signal that rises when the thyroid is underactive and falls when it is overactive. When symptoms are present, a clinician often pairs it with Free T4, and sometimes Free T3, to see the actual thyroid hormone levels.1 TSH plus Free T4 covers most situations; the extras are added for a reason.
Thyroid antibodies (TPO and thyroglobulin) help identify autoimmune thyroid disease, the most common cause of an underactive thyroid, and are often checked when there is a family history or a prior abnormal result. In pregnancy, thyroid needs change and the reference ranges differ by trimester, so testing and timing are handled differently and promptly.
Chapter 02 · The fine print
What this guide does not do
This is educational. It does not diagnose a thyroid condition, order any test, or tell you that you need treatment. Many symptoms that point toward the thyroid, such as fatigue or weight change, have other causes, and a single TSH can be misleading without the clinical picture. A licensed physician decides which tests are appropriate, interprets them with your history, and recommends next steps. Individual results vary.
If you are pregnant or on thyroid medication, do not wait on a calculator. Reach out to your clinician, who handles testing and dose changes directly. Individual results vary.
