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Objective: To establish reference ranges for recently developed assays of thyroid function in premature infants. Methods: We measured serum free thyroxine (T 4 ) by direct equilibrium dialysis and serum thyrotropin by a sensitive immunometric method in 104 preterm infants (25 to 36 weeks of gestational age) during the first week of life. Results: The free T 4 level correlated positively...