Free Triiodothyronine T3

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free-t3
$36.86

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IMPORTANT NOTICE ABOUT DISCOUNTED LABS SERVICES: We currently serve the following states:

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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. Free T3 is the unbound portion of T3 that is biologically active.

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.

Hypothyroidism is a condition where T3 blood levels are low. This condition causes cellular dysfunction and metabolic breakdown. Symptoms may include weight gain, constipation, dry skin, and hair loss. Low T3 levels may even lead to the development of chronic diseases such as heart disease and diabetes.

Hyperthyroidism is the term for elevated T3 blood levels. Symptoms can include anxiety, insomnia, heart palpitations, and bowl discomfort.

This test measures the amount of free T3 available to the tissues, or free T3. Many doctors believe that evaluating the levels of free T3 is the best indicator of thyroid function. For a more extensive evaluation of thyroid function, you can order the Comprehensive Thyroid Profile.

The total T3 test measures the concentration of triiodothyronine in the serum. The T3 is increased in almost all cases of hyperthyroidism and usually goes up before the T4 does. Thus T3 levels are a more sensitive indicator of hyperthyroidism than the total T4, and T3 levels are therefore preferred for confirming hyperthyroidism that has already been suggested by a suppressed TSH result. T3 assays are also useful for the differential diagnosis of T3 thyrotoxicosis, a variant of hyperthyroidism that manifests itself with abnormally elevated T3 and suppressed TSH levels, while T4 levels remain within euthyroid (normal) limits. In hypothyroidism, the T3 is often normal even when the T4 is low. The T3 is decreased during acute illness and starvation and is affected by several medications including Inderal, steroids, and amiodarone. This test measures both bound and free hormone. And only the free hormone is biologically active. Since free T3 accounts for only about 0.5% of the total T3, the measurement of free hormone is generally considered to provide the more reliable indication of true thyroid status. As noted above for T4 levels, anything which affects thyroid-binding globulin (TBG), or albumin will affect the total T3 levels.

  • This test measures the amount of T3 not bound by proteins and available to the tissues, or free T3.
  • Many doctors believe that evaluating the levels of free T3 is the best indicator of thyroid function
  • Needed to determine the level of active thyroid hormone primarily responsible for regulating metabolism to fuel all cellular functions
  • Reference Interval: 2.0−4.4 pg/ml (>19 yr old)
  • Methodology: Electrochemiluminescence Immunoassay (ECLIA)

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IMPORTANT: Discounted Labs only serves these states: Find a Location 

Please read the following frequently asked questions before placing an order: FAQs

 

 

 

HOW DOES DISCOUNTEDLABS.COM WORK?

  1. Go to the "Find a Location" page to find the closest lab location. No need to make an appointment since walk-ins are welcomed. Once you have identified your closest location, go to step 2.

    NOTE: We serve all states in the U.S. except New York, New Jersey, and Rhode Island. Residents of those states need a written lab order from an in-state provider. Individuals cannot obtain a blood draw in neighboring states.
  2. Go to "Choose a Test" and add your selection (s) in the shopping cart. If you prefer to save money on bundled tests, we have created "Lab Test Panels" that can help you decide what to order.

  3. If you have a discount coupon code, add it to your cart.

  4. A $8 lab processing fee will be added to your total.

  5. Pay using a credit card.

  6. You will receive an order confirmation and instructions email on how to download your lab request.

  7. Print lab request form that you downloaded.

  8. Take that form to the closest Quest Diagnostics location with a picture ID. Get your blood drawn.

  9. You will receive an email when the results are ready for you to download.

    Note: You cannot place an order under someone else's profile. The profile person's name will appear on the lab order form.

    If you have questions, please review our FAQ Page.

    If you have further questions, please email [email protected].

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