Should You Get a T3 Test If You Find It Hard to Lose Weight?


Triiodothyronine (T3) and weight loss are often discussed together for good reason!


T3 is the most potent thyroid hormone that naturally revs up your metabolism. Far greater amounts of T3 are converted from thyroxine (T4) when your body wants to step up metabolism. Low T3 is associated with sluggish metabolism and many of the symptoms of hypothyroidism.


Adequate T3 assists fat burning which is important for weight loss. It can also reduce many of the other symptoms of an under active thyroid. This thyroid hormone is also involved in stimulating energy production and protects against heart palpitations.


In fact, low T3 can have far-reaching effects in the body. Reduced T3 activity is often associated with a slow heart rate, lower than normal body temperature, thyroid hair loss and chronic fatigue.


A single T3 test of your T3 level therefore provides the best clue as to how your thyroid is working.


If you are finding it hard to lose weight it is a good idea to discuss doing a free T3 test with your health practitioner.


Should you get a T3 test?


Getting a diagnosis of hypothyroidism has sparked an ongoing debate on what thyroid hormones should be tested and the levels that will reveal a thyroid hormone deficiency.


A single test of thyroid stimulating hormone (TSH) is often the preferred test used by medical practitioners to diagnose a thyroid disorder.


TSH is not actually produced in the thyroid. It is a hormone made by the pituitary gland which is located in the brain. When the pituitary releases TSH this hormone travels to the thyroid to stimulate the release of the thyroid hormones. The thyroid responds by getting busy making your thyroid hormones.


When TSH is high this indicates the thyroid is functioning below par and therefore requires more stimulation than usual.


The problem lies in defining a ‘normal’ range for TSH. I have found that even when TSH is considered ‘normal’ many individuals experience symptoms of hypothyroidism. A TSH test result should ideally be less than 2.0 mIU/L.


Watch this Video Below Here – Interpreting Thyroid labs, part 1.Low TSH. Saul Marcus Naturopathic Doctor

An accurate assessment of thyroid health can only be achieved by testing 5 key thyroid hormones. A measure of both T4 and T3 along with TSH is therefore essential.


When discussing a T3 test with your doctor it is best to specify testing free T3. The majority of T3 in the blood is carried by a protein compound called thyroxine binding globulin. A small amount of T3 is unattached and ‘free’ to do its job. A T3 blood test usually measures both bound and free T3. When you test free T3 you are measuring the active component.


Watch this Video Below Here – Interpreting Thyroid labs, part 2: T3, T4 & Reverse T3. Saul Marcus ND

Your T3 blood test result – What is considered a good number?


The standard reference range for free T3 is 4.0-8.0 pmol/L. This provides a very good clue that you ideally want to see your free T3 test result above 4.0 pmol/L.


If you are experiencing the typical signs and symptoms of an under active thyroid but your TSH, free T4, and even your free T3 appear to be normal you may want to consider checking your reverse T3.


Should you test thyroid antibodies?


A measure of thyroid antibody levels will rule out Hashimoto’s thyroiditis. This is a common thyroid autoimmune disorder that tends to run in families and affects women more than men.


If you have swelling or discomfort around your throat your healthcare practitioner should also perform a physical examination. If required a thyroid ultrasound will provide a more in depth investigation of your thyroid.


Read the following related articles:


10 Hypothyroidism Diet Tips to Help Heal Your Thyroid


Warnings: 4 Types of Toxic Cookware to Avoid & Why


What is really The Best Cooking Oil for Thyroid Health?


5 Important Steps for Hypothyroidism Treatment Success


Hormone Problem? Here’s Your Hormone Imbalance Checklist


Are Iodine Supplements For Thyroid Health Really Safe?


What is Hashimoto’s Thyroiditis?


Skin Deep. Do Cosmetics Harm the Thyroid?


What is the Best Way to Diagnose Hypothyroidism?


Can Basal Temperature Testing Help Diagnosis A Thyroid Problem?


Author Bio:


Louise O’ Connor, the author of The Natural Thyroid Diet –The 4-Week Plan to Living Well, Living Vibrantly, who is a specialist in Thyroid Health. She is a highly regarded Australian Naturopath and founder of Wellnesswork.


The Natural Thyroid Diet goes beyond diet advice and offers practical and effective ways to achieve healthy thyroid levels within just a short period of time. For more details, Click on




I have interests on sexuality topics and I have a blog which acts as a platform for men and women to look for ideas and solutions to improve their sex life, boost their performance and satisfaction. You can see more of it at This is not the best blog but I want to do better. It will be nice if you can make suggestions that can improve the contents to give readers a better experience when they come to my site. I am also open to offer to be guest bloggers of my site.

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