REAGENT KIT, ALINITY I TOTAL T4 (200TESTS/EA) The Alinity i Total T4 (TT4) assay is a chemiluminescent microparticle immunoassay (CMIA) used for the quantitative determination of thyroxine (Total T4) in human serum and plasma on the Alinity i analyzer The Alinity i Total T4 assay is to be used as an aid in the assessment of thyroid status