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Thyroid Function Tests in the Newborn
  1. M. A. Chadd,
  2. O. P. Gray,
  3. D. F. Davies

    Abstract

    The 131I triiodothyronine (T3) resin uptake test reflects thyroid function more closely than other acceptable tests currently available.

    The T3 uptake and protein-bound iodine (PBI) level were estimated in 20 premature and 20 full-term infants at birth and at the end of 1 week.

    The full-term infant has normal adult values, whereas the premature baby has results extending into the hyperthyroid range at birth, but these fall to within normal limits at 1 week.

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