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Blood Testing, Thyroxine Free, Direct, T4

Item Number: LC001974 | Be the first to review this product!

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List Price: $37.33
Our Price: $28.00
Your Savings: $9.33
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Supplement Overview

Item Catalog Number: LC001974
Click for Blood Testing Information



The thyroid gland produces and secretes T4, otherwise known as thyroxine. Proteins bind to T4 and carry it throughout the bloodstream. Once in the tissues, T4 is released from the proteins and is now free to convert into the more active form called T3. For this reason, many doctors believe that measuring free T4 is a more sensitive test for thyroid hormone production.

High levels of free T4 are associated with symptoms such as anxiety, insomnia, diarrhea, and muscle aches and pains. These symptoms collectively are known as hyperthyroidism.

Low levels of free T4, known as hypothyroidism, are associated with symptoms such as depression, weight gain, dry skin, hair loss, constipation and cold intolerance.

Fasting is not required. Take all medications as prescribed. Do not take supplements the day of the test. This test is also included in the Life Extension thyroid panel.


References:

1. MedlinePlus: T4 test


The blood test services are for informational purposes only. It is not the intention of National Diagnostics, Inc, Life Extension, and DR Vitamin Solutions to provide specific medical advice but rather provide users with information to better understand their health. Specific medical advice including diagnosis and treatment will not be provided. Always seek the advice of a trained health professional for medical advice, diagnosis, or treatment.

Both the physician and the test laboratory are independent contractors with whom National Diagnostics, Inc makes arrangements for your blood tests. Neither National Diagnostics, Inc, Life Extension, nor DR Vitamin Solutions will be liable any acts or commissions of the physician, the testing laboratory, or their agents or employees.

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T3 or triiodothyronine is the active form of the thyroid hormone. T3 acts as a metabolic throttle for fueling all of the daily cellular functions. This test measures the amount of T3 available to the tissues, or free T3.

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