Thyroid Health Test Package

The following is a list of what is included in the item above. Click the test(s) below to view what biomarkers are measured along with an explanation of what the biomarker is measuring.

Also known as: Reverse T3, Reverse Triiodothyronine, RT3, T3 Reverse RT3 LCMSMS, Triiodothyronine Reverse

T3 Reverse, LC/MS/MS

Reverse T3 produced in the thyroid comes from the conversion of the storage hormone T4. Your body, especially the liver, can constantly be converting T4 to RT3 as a way to get rid of any unneeded T4. In any given day approx. 40% of T4 goes to T3 and 20% of T4 goes to Reverse T3. However in any situation where your body needs to conserve energy and focus on something else, it will change the above percentages, changing the conversion of RT3 to 50% or more, and the T3 goes down, down. Examples are emotional, physical, or biological stress, such as being chronically or acutely sick (the flu, pneumonia, etc), after surgery, after a car accident or any acute injury, chronic stress causing high cortisol, being exposed to an extremely cold environment, diabetes, aging, or even being on drugs like beta blockers and amiodarone.

Also known as: Triiodothyronine

T3, Total

Triiodothyronine (T3) is a thyroid hormone. It plays an important role in the body's control of metabolism.

Also known as: Free T3, FT3, T3 Free

T3, Free

This test measures the amount of triiodothyronine, or T3, in the blood.

Also known as: T4 Thyroxine Total

Free T4 Index (T7)

FTI stands for the Free Thyroxine Index and is also sometimes referred to as T7. It is a calculated value determined from the T3 uptake test and total T4 test and provides an estimate of the level of free T4 in the blood.

T4 (Thyroxine), Total

This test measures the amount of thyroxine, or T4, in the blood. T4 is one of two major hormones produced by the thyroid gland. The total T4 test is used to help diagnose hyperthyroidism and hypothyroidism. It is a useful test but can be affected by the amount of protein available in the blood to bind to the hormone.

Also known as: Free T4, FT4, T4 Free

T4, Free

The free T4 test is not affected by protein levels. Since free T4 is the active form of thyroxine, the free T4 test is may be a more accurate reflection of thyroid hormone function.

Thyroglobulin Antibodies

Measurement of thyroglobulin antibodies is useful in the diagnosis and management of a variety of thyroid disorders including Hashimoto's thyroiditis, Graves Disease and certain types of goiter.

Thyroid Peroxidase

Also known as: Thyroid Stimulating Hormone, Thyroid Stimulating Hormone (TSH), Thyrotropin


A TSH test is a lab test that measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland. It tells the thyroid gland to make and release thyroid hormones into the blood.


*Important Information on Lab Test Processing Times: Ulta Lab Tests is committed to informing you about the processing times for your lab tests processed through Quest Diagnostics. Please note that the estimated processing time for each test, indicated in business days, is based on data from the past 30 days across the 13 Quest Diagnostics laboratories for each test. These estimates are intended to serve as a guide and are not guarantees. Factors such as laboratory workload, weather conditions, holidays, and the need for additional testing or maintenance can influence actual processing times. We aim to offer estimates to help you plan accordingly. Please understand that these times may vary, and processing times are not guaranteed. Thank you for choosing Ulta Lab Tests for your laboratory needs.

The Thyroid Health Test Package panel contains 7 tests with 10 biomarkers.

Brief Description: The Thyroid Health Test Package is a comprehensive panel designed to evaluate thyroid function thoroughly. It includes a broad spectrum of tests to measure thyroid hormones, thyroid antibodies, and the thyroid-stimulating hormone, providing a detailed view of thyroid health and potential autoimmune thyroid conditions.

Collection Method: Blood Draw

Specimen Type: Serum

Test Preparation: TSH: The specimen collection after fluorescein dye angiography should be delayed for at least 3 days. For patients on hemodialysis, specimen collection should be delayed for 2 weeks.

According to the assay manufacturer Siemens: "Samples containing fluorescein can produce falsely depressed values when tested with the Advia Centaur TSH3 Ultra assay."

When and Why the Package May Be Ordered

This package is typically ordered for individuals exhibiting symptoms of thyroid dysfunction such as weight changes, altered energy levels, mood swings, and temperature sensitivity. It's also crucial for diagnosing and monitoring thyroid conditions, including autoimmune thyroid diseases.

What the Package Checks For

  • T3 Reverse (rT3): Measures the inactive form of T3, which can provide insight into thyroid function and issues related to conversion of T4 to T3.

  • T3 Total: Represents the total amount of triiodothyronine, including both bound and free T3, in the bloodstream, reflecting overall T3 hormone production.

  • T3 Free (FT3): Assesses the unbound, bioactive form of T3, offering insights into the hormone readily available for cellular action.

  • T4 Total: Measures the total amount of thyroxine, providing a comprehensive view of T4 hormone levels.

  • T4 Free (FT4): Focuses on the free, unbound form of T4, crucial for understanding the active portion of thyroid hormone.

  • Thyroid Peroxidase Antibodies (TPOAb): Key indicators of autoimmune thyroid diseases like Hashimoto's thyroiditis.

  • Thyroglobulin Antibodies (TgAb): Can signal thyroid autoimmunity, providing additional data on potential autoimmune thyroid conditions.

  • Thyroid Stimulating Hormone (TSH): A central regulator of thyroid function, with its levels offering critical insights into thyroid health.

Conditions or Diseases Checked

This extensive panel can help diagnose and manage:

  • Hypothyroidism and Hyperthyroidism: Through the comprehensive measurement of thyroid hormones and TSH.
  • Autoimmune Thyroid Diseases: Such as Hashimoto's thyroiditis and Graves' disease, via thyroid antibody tests.
  • Thyroid Conversion Issues: Assessed by the balance of T3, T4, and rT3 levels.
  • Subclinical Thyroid Disorders: Identified through subtle abnormalities in hormone levels or TSH.

Use of Results by Healthcare Professionals

Healthcare providers use these detailed results to diagnose thyroid disorders accurately, tailor treatment plans, and monitor the effectiveness of interventions, ensuring a personalized approach to thyroid health management.

The Thyroid Health Test Package offers an in-depth evaluation of thyroid function and autoimmune status, making it a valuable tool for diagnosing and managing a wide range of thyroid conditions. With its comprehensive scope, this package is essential for individuals seeking a thorough assessment of their thyroid health, guiding healthcare professionals in delivering effective, personalized care.

We advise having your results reviewed by a licensed medical healthcare professional for proper interpretation of your results.

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