Thyroid Hormone Blood Tests

Taking blood sample

A thyroid blood panel analyzes thyroid hormone metabolism, including central thyroid gland regulation and activity, thyroid production and secretion, peripheral thyroid conversion, and thyroid autoimmunity. 

With this test, unbound levels of T4 and T3 are measured to reflect the bioactive portion of thyroid hormone. This assessment is used in alternative medicine to identify not only overt hyper- and hypothyroidism, but  sub-clinical manifestations of thyroid dysfunction, such as autoimmune reactions and altered conversion of T4 into T3 leading to reverse T3 dominance.


The complete thyroid blood test assesses the following:

  • Hypersensitive thyroid-stimulating hormone (TSH)
  • free thyroxine (fT4)
  • free triiodothyronine (fT3)
  • reverse T3 (rT3)
  • anti-thyroglobulin antibodies (anti-TG)
  • anti-thyroid peroxidase antibodies (anti-TPO)
  • fT4/fT3
  • fT3/rT3

Some alternative medicine practitioners suggest this test for symptoms of fatigue, depression, coldness, hair loss, headaches, PMS, menstrual irregularities, fluid retention, unexplained weight gain or weight loss, anxiety or panic attacks, decreased memory or concentration, muscle and joint pain, low libido, and infertility.

It may also be suggested for people with "functional hypothyroidism", euthyroid sick syndrome (ESS), low T3 syndrome, Wilson's syndrome, Hashimoto's thyroiditis, Graves' disease, or postpartum thyroiditis.

If you are experiencing symptoms and/or are concerned about your thyroid health, it is essential that you talk with your doctor.

 Self-treating and avoiding or delaying standard care can have serious consequences.

Disclaimer: The information contained on this site is intended for educational purposes only and is not a substitute for advice, diagnosis or treatment by a licensed physician. It is not meant to cover all possible precautions, drug interactions, circumstances or adverse effects. You should seek prompt medical care for any health issues and consult your doctor before using alternative medicine or making a change to your regimen.

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