Use of Tc‐99 m thyroid scans in borderline congenital hypothyroidism

BACKGROUND: Mild or borderline congenital hypothyroidism [often referred to as mild neonatal hyperthyrotropinemia (MNH)] is characterized by an abnormal newborn screen (NBS), followed by mildly elevated TSH and normal FT4 on confirmatory testing. This condition is increasingly observed, but data regarding optimal management are limited. OBJECTIVE: Examine the use of routine technetium thyroid scanning (TS) in the management of MNH.