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Normal free T3 levels. Providers don’t usually order free T3 tests because they’re not as reliable, but it is possible to test these levels. In general, normal ranges of free T3 for healthy people include: Infants up to 3 days old: 1.4 – 5.4 picograms per milliliter (pg/mL). Infants 4 to 30 days old: 2.0 – 5.2 pg/mL.
Normal T3 levels indicate that someone’s thyroid is producing an adequate amount of T3 hormone. High levels can indicate hyperthyroidism, and low levels can be a sign of hypothyroidism.
This article will discuss normal and abnormal free T3 levels. It will also cover what to expect when receiving a free T3 test.
T3 testing rarely is helpful in the hypothyroid patient, since it is the last test to become abnormal. Patients can be severely hypothyroid with a high TSH and low FT4 or FTI, but have a normal T3. FREE T3 Measurement of free T3 is possible, but is often not reliable and therefore not typically helpful. REVERSE T3
Free T3 Thyroid Test Result. If your Free T3 level is high in your thyroid test results, it indicates that your thyroid is overactive or hyperthyroidism. If your Free T3 is low in your thyroid test results, you may not be converting T4 to Free T3 very well.
For total T3, the normal range in adults is about 71 – 180 ng/dL . For free T3, the normal range in adults is about 2.0 – 4.4 pg/mL . Normal T3 levels don’t necessarily mean there are no issues with the thyroid. For example, some people with hypothyroidism have normal T3 levels.
Total T3: The total amount of T3 (bound and unbound) in your bloodstream; Free T3: The amount of unbound T3 available for use in tissues; Reverse T3: An inactive form of T3 that has no utility but can block free T3 from entering tissues
Most of the T3 in your blood is attached — or bound — to proteins, and only a small percentage of it is free. A total T3 test measures both bound and free T3, whereas a free T3 test measures...
Free T3 is the active form that enters your tissues where it's needed. Bound T3 is attached to certain proteins which prevent it from entering your tissues. Most of your T3 is bound. There are different tests for measuring T3: A total T3 test measures both bound and free T3 together.
When you specifically have too much T3, you might experience thyrotoxicosis, a condition that comes from an overactive thyroid gland, or hyperthyroidism. It’s also important to note that hormone...