Thyroid Health - Basic Lab Panel Most Popular

The Thyroid Health - Basic Lab Panel panel contains 4 tests with 6 biomarkers.

The Thyroid Health - Basic lab panel contains four tests that measure six biomarkers to assess thyroid function. The first test, T4 (Thyroxine), Total, measures the amount of thyroxine in the blood. The second test, T4, Free, measures the amount of free thyroxine in the blood. The third test, TSH, measures the level of thyroid stimulating hormone in the blood. The fourth test, T3 Uptake, measures the uptake of triiodothyronine by the thyroid gland. This panel is important for assessing thyroid function and can help diagnose thyroid disorders.

The Thyroid Health - Basic lab panel includes:

  • Thyroid-Stimulating Hormone (TSH)
  • T3 Uptake
  • T4 (Thyroxine), Total
  • T4, Free

Consider the Thyroid Health - Advanced Lab panel, which includes additional T3 Total T3, Free, T3 Reverse (RT3), Thyroid Peroxidase, and Thyroglobulin Antibodies tests for a more comprehensive picture of your thyroid health. Consider the Thyroid Health - Comprehensive lab panel, which includes all of the tests in the advanced panel as well as TBG (Thyroxine Binding Globulin) and TSI (Thyroid Stimulating Immunoglobulin).

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.

T3 Uptake

T3 uptake is also known as T3 Resin Uptake (T3RU) or Thyroid Uptake. It estimates how much thyroid hormone-binding proteins are available in the blood through a calculation based on levels of T3 or T4 added to a person's blood specimen.

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.

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.


*Process times are an estimate and are not guaranteed. The lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

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