Thyroid Panel
A thyroid panel is a blood test that measures certain hormones your thyroid makes and thyroid-related antibodies. It measures levels of TSH, free/total T4, free/total T3 and thyroid antibodies, like TPO (thyroid peroxidase antibodies). The results help diagnose conditions like overactive thyroid and underactive thyroid.
What Is a Thyroid Panel?
A thyroid panel measures the hormones made by your thyroid gland and antibodies that might affect thyroid function. It’s a blood test that can help your provider diagnose thyroid disorders and see how well your thyroid is working.
There are different types of thyroid panels. Your healthcare provider can tell you which thyroid panel or combinations of tests you need based on your symptoms and health history. A full thyroid panel measures the levels of these hormones and antibodies:
- TSH (thyroid-stimulating hormone)
- T3 or free T3 (triiodothyronine)
- T4 or free T4 (thyroxine)
- TPO (thyroid peroxidase antibodies)
- Tg (thyroglobulin)
- Tg Ab (thyroglobulin antibodies)
- TSI (thyroid-stimulating immunoglobulin)
A standard thyroid panel only measures these hormones:
- TSH
- T3 or free T3
- T4 or free T4
A thyroid antibody panel measures thyroid antibodies like:
- TPO
- Tg Ab
Who needs a thyroid panel?
You may need this test if you have symptoms of a thyroid disorder. These include unexpected weight loss/weight gain, fatigue, mood changes, being too hot or too cold often, and dry skin or hair loss.
Healthcare providers also use thyroid panels to:
- Check your overall thyroid function
- Diagnose thyroid conditions, like underactive thyroid or overactive thyroid
- Monitor if your thyroid medication is working
- Screen for thyroid disorders in people with risk factors for thyroid diseases
- Diagnose autoimmune thyroid conditions like Graves’ disease or Hashimoto’s disease
How does the test work?
A thyroid panel is a blood test. It involves a healthcare provider taking a sample of your blood from a vein in your arm. It takes just a few minutes. Your blood is then sent to a lab where it is analyzed. Your provider gets a report that shows thyroid hormone and/or antibody levels in your blood. They use this information to figure out if you have a thyroid disorder.
The only risks and side effects of a thyroid panel are those that come with a blood draw. Blood draws have minimal risks, and the side effects are usually minor. Possible side effects could include bruising, swelling or mild pain where the needle was inserted.
What happens after a thyroid panel?
It can take up to a week to get your results back. Your healthcare provider will explain what the results mean for your thyroid health. Depending on your results, they may recommend additional tests or they may want to schedule a follow-up thyroid panel for a later date.
What type of results do you get and what do the results mean?
Each hormone or antibody in a thyroid panel is measured separately. Your provider looks at the result of each level and compares it to the normal range. Then, they look at how all the results fit together.
In general, providers prefer these results (normal ranges may vary depending on where the test is performed due to different testing methods):
- TSH: 0.3 to 4.0 mIU/L
- Free T3: 2.3 to 4.1 pg/mL
- Free T4: 0.7 to 2.1 ng/dL
- Thyroid peroxidase antibodies (TPOAb): Less than (<) 5.6 IU/mL
- Thyroglobulin antibodies (TgAb): < 4 IU/mL
- Thyroid-stimulating hormone receptor antibodies (TRAb): < 1.75 IU/L or < 3.3 IU/L, depending on the type of test
- Thyroid-stimulating immunoglobulin (TSI): < 0.55 IU/L
When should I call my doctor?
Contact your healthcare provider if you have any questions about your thyroid panel test results and what they mean. Don’t try to interpret your results without talking to your provider.
References
- American Thyroid Association. Thyroid Function Tests (https://www.thyroid.org/thyroid-function-tests/). Accessed 1/5/2026.
- InformedHealth.org [Internet]. Cologne, Germany: Institute for Quality and Efficiency in Health Care (IQWiG); 2006-. In brief: Understanding thyroid tests (https://www.ncbi.nlm.nih.gov/books/NBK279414/). [Updated 2024 May 28]. Accessed 1/5/2026.
- Kluesner JK, Beckman DJ, Tate JM, et al. Analysis of current thyroid function test ordering practices (https://pubmed.ncbi.nlm.nih.gov/29105255/). J Eval Clin Pract. 2018;24(2):347-352. Accessed 1/5/2026.
- Lewandowski K. Reference ranges for TSH and thyroid hormones (https://pmc.ncbi.nlm.nih.gov/articles/PMC4480274/). Thyroid Res. 2015;8(Suppl 1):A17. Published 2015 Jun 22. Accessed 1/5/2026.
- National Guideline Centre (UK). Thyroid function tests: Thyroid disease: assessment and management: Evidence review C (https://www.ncbi.nlm.nih.gov/books/NBK577224/). London: National Institute for Health and Care Excellence (NICE); 2019 Nov. (NICE Guideline, No. 145.). Accessed 1/5/2026.
- Spencer CA. Laboratory Thyroid Tests: A Historical Perspective (https://pubmed.ncbi.nlm.nih.gov/37037032/). Thyroid. 2023;33(4):407-419. Accessed 1/5/2026.
- Yazdaan HE, Jaya F, Sanjna F, et al. Advances in Thyroid Function Tests: Precision Diagnostics and Clinical Implications (https://pmc.ncbi.nlm.nih.gov/articles/PMC10726078/). Cureus. 2023;15(11):e48961. Published 2023 Nov 17. Accessed 1/5/2026.
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