CPT 84439 LNC LP96510-0 English T4 free measurement, Thyroxine; free, Free T4, Free Thyroxine Measurement, unbound T4 level, free thyroxine measurement (lab test), free thyroxine measurement, free T4, free thyroxine (T4) level test, ASSAY OF FREE THYROXINE, Measurement of free thyroxine, Free...