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Total Thyroxine

Total Thyroxine


"Thyroxine (T4) is one of two major hormones produced by the thyroid gland, a small butterfly-shaped organ that lies flat across the windpipe at the base of the throat. The other major thyroid hormone is called triiodothyronine (T3) and together they help control the rate at which the body uses energy. Almost all of the T4 (and T3) found in the blood is bound to protein. The rest is free (unbound) and is the biologically active form of the hormone. This test measures the amount of free T4 in the blood.
Pituitary-Thyroid Feedback System


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

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.

Result explanation

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 the total 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 total triiodothyronine is below the normal range, then it may be indicative of hypothyroidism, pituitary dysfunction, malnutrition, iodine deficiency, etc.

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

Gender Age groups Value

UNISEX All age groups 80 - 200ng/dl

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