99% OF THYROID HORMONE IN THE BLOOD IS BOUND

• THYROXINE-BINDING GLOBULIN (TBG)

• THYROXINE-BINDING PREALBUMIN (TBPA) [TRANSTHYRETIN]

• ALBUMIN

• ABOUT THREE TIMES AS MUCH AS IS SECRETED AND DEGRADED IN A SINGLE DAY (BUFFER)

• T4 BINDS BETTER THAN T3

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