T4 Total

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Product Description

T4 is considered a reservoir or prohormone for T3, the biologically most active thyroid hormone. Measurement of total T4 gives a reliable indication of  thyroid function in the absence of protein binding abnormalities (thyroid horomes not bound to a protein is called free T3 or T4). However, changes in binding proteins can occur which affect the level of total T4 but leave the level of unbound hormone unchanged.

Related TestsTSH, Free T3, Free T4, Total T3
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