Total T3 Blood Test

The Total T3 blood test measures the levels of triiodothyronine (T3) hormone in the bloodstream. T3 is one of the two primary hormones produced by the thyroid gland, and it plays a crucial role in regulating metabolism, growth, and development in the body.

The Total T3 blood test measures the total amount of T3 in the bloodstream, which includes both bound (attached to proteins) and unbound (free) T3. The test is often ordered as part of a thyroid function panel to help diagnose and monitor thyroid disorders, including hyperthyroidism (an overactive thyroid) and hypothyroidism (an underactive thyroid).

The normal range for Total T3 levels can vary depending on factors such as age, gender, and the laboratory performing the test. Generally, normal total T3 levels range from 80 to 200 ng/dL. Low total T3 levels may indicate hypothyroidism, while high total T3 levels may indicate hyperthyroidism.

It is important to note that the Total T3 test is not the most sensitive indicator of thyroid function, as it measures both bound and unbound T3 levels. Free T3 (unbound T3) is considered a more accurate measure of thyroid function and may be ordered in conjunction with the Total T3 test for a more complete evaluation.

This page is provided for educational and informational purposes only and does not constitute the provision of medical advice or professional services. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice regarding any of the tests and conditions referenced above are advised to consult with a licensed clinician. Always seek the advice of your qualified health provider regarding a medical condition and do not disregard professional medical advice or delay in seeking it because of any information on this page. If you think you may have a medical emergency, immediately call 911 or go to the nearest urgent care center or hospital.


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