Test TSH, free T3, free T4, and TPO levels to assess thyroid health.
Gain insights into thyroid health with this comprehensive panel that measures four essential markers: thyroid-stimulating hormone (TSH) and free thyroxine (T4), free triiodothyronine (T3) and thyroid peroxidase (TPO) antibodies. These tests combined provide a fuller picture of how your thyroid is functioning, from hormone production and regulation to potential autoimmune thyroid disorders. Whether you're experiencing symptoms like fatigue, weight changes or mood shifts—or simply want deeper insight into your health—this thyroid panel can help assess how your thyroid is working.
Preparation: Fast for 12 hours (no food or drink, except water). It is recommended to avoid alcohol intake for 24 hours prior to testing. If you’re taking a supplement containing biotin (also called vitamin B7 or B8, vitamin H or coenzyme R), commonly found in products promoting nail, skin and hair health, we recommend that you wait at least 72 hours from your last dose before taking the test.
A custom thyroid test that includes Free T4, Free T3, TSH and TPO antibodies offers a more comprehensive view of your thyroid health. When combined, these tests can help assess thyroid function and autoimmune conditions.
Go beyond standard TSH and free T4 testing and evaluate free T3 and TPO antibodies if you are experiencing symptoms of hyperthyroidism such as fatigue, trouble sleeping, weight loss or mood changes. A comprehensive thyroid panel can help you and your healthcare provider evaluate symptoms and conditions related to abnormal thyroid levels.
If you’re experiencing symptoms such as fatigue, weight gain or mood changes, a TPO test may help you uncover if an autoimmune disorder such as Hashimoto’s thyroiditis or Graves’ disease could be affecting your thyroid function.
1. Mayo Clinic. Hypothyroidism (underactive thyroid). December 10, 2022. Accessed August 9, 2023. https://www.mayoclinic.org/diseases-conditions/hypothyroidism/symptoms-causes/syc-20350284
2. Mayo Clinic. Hyperthyroidism (underactive thyroid). November 30, 2022. Accessed August 9, 2023. https://www.mayoclinic.org/diseases-conditions/hyperthyroidism/symptoms-causes/syc-20373659
3. American Thyroid Association. Hashimoto’s Thyroiditis. Accessed October 9, 2024. https://www.thyroid.org/hashimotos-thyroiditis.
<p>1. Mayo Clinic. Hypothyroidism (underactive thyroid). December 10, 2022. Accessed August 9, 2023. <a href="https://www.mayoclinic.org/diseases-conditions/hypothyroidism/symptoms-causes/syc-20350284" title="Hypothyroidism Access" target="_blank" rel="noopener noreferrer"><b>https://www.mayoclinic.org/diseases-conditions/hypothyroidism/symptoms-causes/syc-20350284</b></a></p> <p>2. Mayo Clinic. Hyperthyroidism (underactive thyroid). November 30, 2022. Accessed August 9, 2023. <a href="https://www.mayoclinic.org/diseases-conditions/hyperthyroidism/symptoms-causes/syc-20373659" title="Hyperthyroidism Symptoms" target="_blank" rel="noopener noreferrer"><b>https://www.mayoclinic.org/diseases-conditions/hyperthyroidism/symptoms-causes/syc-20373659</b></a></p> <p>3. American Thyroid Association. Hashimoto’s Thyroiditis. Accessed October 9, 2024. <a href="https://www.thyroid.org/hashimotos-thyroiditis/" title="hashimotos-thyroiditis" target="_blank" rel="noopener noreferrer"><b>https://www.thyroid.org/hashimotos-thyroiditis</b></a>.</p>
Simply purchase this test online. A healthcare provider will review and approve your test requests; no healthcare provider visit is required.
Visit a Labcorp location near you for sample collection. Visits may be scheduled online.
View your easy-to-read results online in your Labcorp Patient™ account, including Linked Accounts. For certain results that require prompt attention, you will also be contacted by phone or mail.
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Low TSH levels typically indicate an overactive thyroid (hyperthyroidism), suggesting that the thyroid gland is producing too much thyroid hormone. Common symptoms may include rapid heartbeat, weight loss, anxiety and heat sensitivity.
It’s important to consult with your healthcare provider for proper interpretation and potential follow-up testing or treatment.
High TSH levels typically indicate an underactive thyroid (hypothyroidism), suggesting the thyroid gland isn’t producing enough thyroid hormone. This prompts the pituitary gland to release more TSH in an effort to stimulate thyroid activity. Common symptoms may include fatigue, weight gain, cold intolerance, constipation and dry skin.
It’s important to consult with your healthcare provider for proper interpretation and potential follow-up testing or treatment.
Hashimoto’s thyroiditis (sometimes referred to as Hashimoto’s disease) is a chronic autoimmune disorder that affects the thyroid gland. In this condition, the immune system mistakenly attacks the thyroid, leading to inflammation and a gradual decline in thyroid hormone production—a state known as hypothyroidism.
Symptoms may include3:
Hashimoto’s disease is the most common cause of hypothyroidism and usually develops slowly over time. You might not notice any symptoms in the early stages, even if a blood test shows thyroid antibodies. It tends to affect women more frequently than men, especially between the ages of 30 and 50.
Because symptoms can be subtle or overlap with other conditions, testing key thyroid markers such as TSH, FT4, FT3 and TPO antibodies can be essential for accurate diagnosis. Always consult with your healthcare provider to interpret results and determine the best course of action.
You’ll be able to view your results for each test in your Labcorp Patient™ account as they become available. This test includes multiple tests, and you should be able to see all your test results online within 1-2 days of when your samples arrive at our lab.
Your testing will be performed in a CLIA-certified clinical laboratory. Labcorp provides leading-edge medical laboratory tests and services through a national network of primary clinical laboratories and specialty testing laboratories. Our labs perform regular quality assurance testing to ensure our results are accurate.
Your results will be provided to you through our secure online portal to view or print. Results are also made available through a secure portal to the independent healthcare provider who placed your test order. If you are accessing your results through your Labcorp Patient™ account, all users linked to the account will have access to all OnDemand test results. Results may also be provided to a local, state, and/or federal health authority; for example, many states require the testing laboratory and physician to report test results for certain communicable diseases, such as COVID-19, to local or state health departments.
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Visit the Labcorp OnDemand® website to browse and purchase laboratory tests and create your Labcorp Patient™ account to view your results. All Labcorp OnDemand testing requires an order from an authorized healthcare professional. For your convenience, Labcorp OnDemand has contracted with independent professional entities (collectively, Providers) to deliver healthcare provider services. Visit a Labcorp location for sample collection; or, if using an at-home collection kit, collect your sample yourself. We’ll let you know when your results are ready and can be accessed through your Labcorp Patient™ account.
To align with clinical best practices, we’ve set an age maximum of 100 for consumer-initiated testing. This limit was set to encourage individuals in more advanced age groups - who may have complex medical needs - to receive personalized guidance about testing from their healthcare providers.
