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Free T3

Also known as Free Triiodothyronine Blood
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What is this test?

This test is used to measure the levels of free triiodothyronine (FT-3) in the blood. The thyroid gland produces hormones known as triiodothyronine (T3) and thyroxine (T4). These hormones help to control the rate at which energy is used in almost every tissue in the body.

What is Free T3?

Most of the triiodothyronine in the blood is bound reversibly to various transport proteins; this is known as bound T3. The remaining triiodothyronine freely circulates in the blood (free T3) and is available to the body for use.

Why this test is performed?

This test is used to identify if the thyroid gland is hyperactive (hyperthyroidism) or underactive (hypothyroidism). Hyperthyroidism is a condition where the thyroid gland produces too many hormones. This condition may cause signs and symptoms such as a sudden weight loss, irritability, sweating, irregular heartbeats, etc. Hypothyroidism is a condition where the thyroid gland does not produce enough amount of hormones. This condition may cause signs and symptoms such as a sudden weight gain, dry skin, constipation, feeling cold, slow heart rate, etc. Your doctor may ask you to undergo this test if you are suffering from any such symptoms.

Your doctor may also advise you to undergo this test if your free thyroxine levels are normal and thyroid stimulating hormone (TSH) levels are abnormal.

If you are suffering from a thyroid disorder and receiving treatment for the same, your doctor may advise you to undergo this test as part of routine monitoring as well as to determine the effectiveness of the treatment.

Frequency:

If you are a healthy individual above the age of 35, your doctor may advise you to undergo this test either on a yearly basis or every other year. If you have been diagnosed with a thyroid disorder, your doctor may advise you to undergo this test once every 3 months to once a year based on your clinical condition.

Precautions:

Drugs such as amiodarone, birth control pills, multivitamin pills, etc. may affect the results of this test. Hence, all medications should be reported to the doctor before undergoing this test.

Also known as FT3 Blood, Free T3 Blood, Free Triiodothyronine, FT3.

Test Preparation

Inform your doctor if you are on any medications, have any allergies or underlying medical conditions before your Free T3. Your doctor will give specific instructions depending on your condition on how to prepare for Free T3.

No specific preparation is necessary for this test. However, if it is performed along with other blood tests, you may need to fast (not eat or drink) for several hours, as instructed by the doctor.

Understanding your test results

If you are a healthy individual and the test results are in the normal range, then the thyroid gland is functioning normally and there is no need for medical intervention.

If you have been diagnosed with a thyroid disorder and the test results are in the normal range, then the treatment you are receiving is working effectively.

If free triiodothyronine levels are above the normal range, it may be indicative of hyperthyroidism. Certain conditions such as Grave’s disease (an immune system disorder which results in the overproduction of thyroid hormones), thyroiditis (inflammation of the thyroid gland), toxic multinodular goiter, thyroid cancer, etc. may also be responsible for the increased levels of total triiodothyronine hormone in the blood.

If the level of free triiodothyronine is below the normal range, then it may be indicative of hypothyroidism, pituitary dysfunction, a long-term illness, malnutrition, iodine deficiency, etc.

If the free triiodothyronine levels are above or below the normal range, consult your doctor immediately.

GenderAge groupsValue
UNISEXAll age groups1.8 - 5.4mcg/dl
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