T4

The Biorex Diagnostics T4 kit is intended for use in the quantitative determination of total thyroxine concentration in human serum or plasma by a microplate chemiluminescence immunoassay (CLIA).

Measurement of serum thyroxine concentration is generally regarded as an important in vitro diagnostic test for assessing thyroid function. This importance has provided the impetus for the significant improvement in assay methodology that has occurred in the last three decades. This procedural evolution can be traced from the empirical protein bound iodine (PBI) test to the theoretically sophisticated radioimmunoassay.