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T4 concentrations in preterm infants at birth, by birth weight (heel-stick samples obtained at 2 to 5 days of age)

T4 concentrations in preterm infants at birth, by birth weight (heel-stick samples obtained at 2 to 5 days of age)
Weight, grams T4, mcg/dL T4, nmol/L
<1000 5.6±3.0 72±38
1000 to 1500 7.7±2.7 100±35
1500 to 2000 9.6±2.7 124±32
2000 to 2500 11.2±2.4 144±31
>2500 12.0±2.0 154±26
T4: thyroxine.
Adapted from Frank JE, Faix JE, Hermos RJ, et al. J Pediatr 1996; 128:548.
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