Chadd M A, Gray O P, Davies D F
Arch Dis Child. 1970 Jun;45(241):374-5. doi: 10.1136/adc.45.241.374.
The I triiodothyronine (T) resin uptake test reflects thyroid function more closely than other acceptable tests currently available. The T 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.