?:definition
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Immunoassay reagents intended to perform qualitative and/or quantitative analyses on a body fluid sample (typically serum) to determine the unsaturated thyroid hormone (either triiodothyronine (T3) or thyroxin (T4)), binding capacity (i.e., the number of unoccupied thyroid hormone binding sites on serum proteins). Usually these values (i.e. the \'uptake\' results) are determined in relation to values in serum from patients with normal thyroid hormones (i.e., euthyroid patients). The determinations of the relative free fraction of T3 or T4 are known as the thyroid hormone binding ratio (THBR).
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