Thyroid Hormone Test - Thyroxine - T4

This test measures the blood level of a hormone made by the thyroid gland (Thyroxine, which is also known as T4).




This test measures the blood level of a hormone made by the thyroid gland (Thyroxine, which is also known as T4).



This test measures the blood level of T4 (Thyroxine), a hormone made by the thyroid gland. It is often done along with or after a thyroid-stimulating hormone (TSH) test and Triiodothyronine (T3) test.

  • Thyroid hormones help control how the body uses energy, and are also associated with managing body temperature, muscle function, heart rates and mental functioning.
  • This test may be done with other thyroid tests to see how well your thyroid gland is working.
  • It is also a common screening test in newborns.

In an adult, the blood sample is taken by placing a needle in a vein in the arm. In a newborn, the sample is taken by pricking the baby's heel.

  • Be sure to tell your healthcare provider about any medications you are taking. Some can interfere with the test.
  • This care path's costs do not include the charge to draw blood from a vein (venipuncture).
  • There will only be one charge to draw blood, even if multiple tests are being performed on the samples that are taken.

What should I ask my healthcare provider before having this test?

  • Is there any special preparation for the test? (If so, get clear instructions on what you need to do.)
  • What is the reason for the test? Will the test results change my treatment plan? If not, do I need the test?

Source UHC.com

Also known as:

TSH
TRH
Thyroxine
Thyroid Hormone Test - Thyroxine - T4
Thyroid Gland
Thyroid Function
Thyroid Blood Test
Thyroid
T4 Blood Test
Laboratory Work
Hypothyroidism
Hypothyroid Test
Hyperthyroidism
Hyperthyroid Test
Goiter
Blood Test for Thyroid Disorder


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