Change in Adult Reference Range for Free Thyroxine (Free T4) Assay
Beginning February 23, 2016, the University of Iowa Hospitals and Clinics (UIHC) core clinical laboratory will change the adult (18+ years old) reference range for free thyroxine (T4):
Test | Epic # | Previous range | New Range |
THYROXINE – FREE (FREE T4) | LAB127 | 0.90 – 1.70 ng/dL | 0.80 – 1.80 ng/dL |