science
Lab Test
Thyroid Panel: TSH, T3, and T4 Results Explained
A thyroid panel evaluates how well your thyroid gland is functioning. The thyroid controls metabolism, energy, heart rate, mood, weight, and body temperature. The panel typically includes TSH, free T4, and sometimes free T3 and thyroid antibodies.
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What It Tests
TSH (Thyroid-Stimulating Hormone), free T4 (thyroxine), free T3 (triiodothyronine), and optionally thyroid antibodies (anti-TPO, anti-thyroglobulin).
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Why It's Ordered
Thyroid panels are ordered to diagnose hypothyroidism, hyperthyroidism, Hashimoto's thyroiditis, Graves' disease, and to monitor thyroid replacement therapy.
Markers in This Test
Frequently Asked Questions
What is the most important thyroid test? expand_more
TSH is the primary screening test for thyroid dysfunction. It is the most sensitive indicator of thyroid status and is usually the first test ordered.
What is Hashimoto's thyroiditis? expand_more
Hashimoto's is an autoimmune condition where the immune system attacks the thyroid, gradually destroying its ability to produce hormone. It is the most common cause of hypothyroidism.
Can thyroid disease be cured? expand_more
Hypothyroidism is managed (not cured) with daily thyroid hormone replacement. Hyperthyroidism can sometimes be put into remission with medication or treated permanently with radioiodine or surgery.
Should I take my thyroid medication before a thyroid test? expand_more
For TSH monitoring, take your medication after the blood draw for the most consistent results. Always follow your doctor's specific instructions.
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