![]() ![]() Several factors can cause a change in T4 levels. Conversely, hyperthyroidism is when an overactive thyroid gland produces too much hormone. Hypothyroidism is the medical term for an underactive thyroid gland that does not produce enough hormone. ![]() Depending on the direction of change, this can result in hypothyroidism or hyperthyroidism. Sometimes a person’s T4 levels may change and fall outside the normal range. A T4 value at the low or high end of normal for one person may be typical for another. ![]() The table below shows the normal range for free T4 levels.Īlthough the normal T4 range is wide, levels usually remain stable for each person. Normal levels in childrenįor children, normal T4 ranges vary according to age. A 2011 study in the Journal of Thyroid Research outlines the normal ranges for pregnant women as 0.95–1.53 ng/dl in the first trimester and 0.87–1.45 ng/dl in the second trimester. Normal T4 levels also vary across trimesters of pregnancy. Normal levels of free T4 range from 0.8–1.8 nanograms per deciliter (ng/dl) of blood. In adults, normal levels of total T4 range from 5–12 micrograms per deciliter (mcg/dl) of blood. Combining a free T4 test with a TSH test gives the most accurate insight into how the thyroid is functioning. A total T4 test detects levels of both bound and free T4, while a free T4 test only identifies free T4 levels.Ī healthcare provider may also recommend a TSH test to assess thyroid function. Free T4 does not attach to proteins, so it is free to enter body tissues that use it.Ī healthcare provider can use two blood tests to determine whether a person’s T4 levels are within a normal range. Bound T4 attaches to proteins that prevent it from entering the body’s tissues. There are two types of T4: bound and free. ![]()
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