The Finecare FT3 reagent refers to the test kit components (cartridges, buffer reagents, pipette tips, and ID chip) used with a FinecareTM Fluorescence Immunoassay (FIA) Analyzer to quantitatively measure Free Triiodothyronine (FT3) — a key thyroid hormone — in human blood samples (whole blood, serum, or plasma). It’s an in-vitro diagnostic reagent for professional use only.