This panel contains the following tests:

• Thyroid-Stimulating Hormone (TSH) - Evaluates overall thyroid function
• Total Thyroxine (T4) - Measures the total amount of T4 produced by the thyroid gland
• Free Thyroxine (T4) - Measures the amount of T4 available to the cells and tissues
• Free Tri-iodothyronine (T3) - Measures the amount of T3 (the active form of the hormone) available to the cells and tissues
• Reverse T3 - Measures the non-functioning form of the active hormone T3
• Thyroglobulin antibody (ATA) - Often measured along with TPO, these antibodies can attack proteins involved in the production of thyroid hormones rendering them dysfunctional
• Thyroid Peroxidase antibody (TPO) - Often measured along with ATA, these antibodies can attack proteins involved in the production of thyroid hormones rendering them dysfunctional

Sample Report

Your thyroid gland sits in the lower portion of your neck and acts as the metabolic throttle for every cell in your body. When your thyroid doesn't function efficiently, it can affect every cell in your body. An estimated 27 million Americans have thyroid disease, and about 13 million of them are undiagnosed.¹ Since symptoms can often be vague such as fatigue, depression, and weight gain, many people are not tested for thyroid dysfunction.

Instructions

Fasting is not required for this test. Take all medications as prescribed.

References

1. J Am Acad Nurse Pract. 2004 Oct;16(10):422-5.