REAGENT KIT, ALINITY I FREE T4(200TESTS/EA) The Alinity i Free T4 assay is a chemiluminescent microparticle immunoassay (CMIA) used for the quantitative determination of free thyroxine (free T4) in human serum and plasma on the Alinity i analyzer The Alinity i Free T4 assay is to be used as an aid in the assessment of thyroid status