Most of the free hormone immunoassays in current use employ a specific, high affinity hormone antibody to sequester a small amount of total hormone from the specimen. The unoccupied antibody ...

The thyroid gland primarily secretes two hormones, thyroxine and triiodothyronine, commonly known as T4 and T3.

It has been recommended that a normal serum sample standard be used to normalize the response of the assays and allow the reporting of the result as a ratio to normal i.e. a "Thyroid Hormone ...