Thyroid Health Test Package (Add-on 5 Tests)

There are no preparation instructions.

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.

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

*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 (Add-on 5 Tests) panel contains 5 tests with 7 biomarkers.

Brief Description: The Thyroid Health Test Package (Add-on 5 Tests) is designed to provide an extensive evaluation of thyroid function and autoimmunity. This add-on package includes tests that measure different forms of thyroid hormones and antibodies, offering a detailed assessment when combined with the foundational Thyroid Health Test Package (TSH and FT4).

Collection Method: Blood Draw

Specimen Type: Serum

Test Preparation: No preparation required.

When and Why It May Be Ordered

This package is often ordered when initial thyroid screening (TSH and FT4) suggests an imbalance or when there's a need for a more comprehensive evaluation to diagnose conditions like autoimmune thyroiditis or to understand the complexity of a patient's thyroid disorder better.

What the Package Checks For

  • T3 Reverse (rT3): Measures the inactive form of T3, providing insight into thyroid hormone metabolism and potential issues with thyroid hormone conversion.

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

  • T3 Free (FT3): Assesses the unbound portion of T3 available to cells, crucial for understanding metabolic activity.

  • T4 Total: Measures the total thyroxine in the blood, encompassing both bound and free T4, reflecting the thyroid's output.

  • Thyroid Peroxidase Antibodies (TPOAb): Detects antibodies against thyroid peroxidase, an enzyme involved in thyroid hormone production, indicating autoimmune thyroiditis.

  • Thyroglobulin Antibodies (TgAb): Identifies antibodies against thyroglobulin, a protein in the thyroid gland, suggesting autoimmune involvement.

Integration with the TSH and FT4 Package

When used alongside the basic TSH and FT4 tests, this add-on package offers a comprehensive view of thyroid health, enabling healthcare professionals to detect and differentiate between various thyroid disorders, assess the severity of the condition, and monitor response to treatment.

Conditions or Diseases Checked

The tests in this package can help diagnose and manage:

  • Hashimoto's Thyroiditis: Through the detection of thyroid antibodies.
  • Graves' Disease: By assessing thyroid antibodies and hormone levels.
  • Thyroid Hormone Resistance: Indicated by abnormal levels of free and total hormones.
  • Non-Thyroidal Illness Syndrome: Suggested by altered levels of rT3 and other thyroid hormones.

Use of Results by Healthcare Professionals

Healthcare professionals utilize these results to diagnose specific thyroid conditions accurately, tailor treatment plans, and monitor the effectiveness of therapeutic interventions, ensuring personalized patient care.

The Thyroid Health Test Package (Add-on 5 Tests) enriches the foundational assessment provided by the TSH and FT4 tests, offering a thorough examination of thyroid function and autoimmune status. This comprehensive approach is instrumental in diagnosing complex thyroid conditions, guiding treatment, and managing patient health effectively.

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

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