Abstract
st meconium passage time, respiratory distress syndrome and apnea on thyroid hormone levels were assessed by Mann-Whitney U-test and multiple linear regression analysis. Results: With advancing gestational age, T3 and fT4 displayed a tendency to increase. FT4 showed a positive correlation pattern with antenatal steroid therapy, corrected gestational age at examination and a negative correlation pattern with 1st meconium passage time and apnea (P<0.05). TSH displayed a positive correlation pattern with 1st meconium passage time, 5-minute Apgar score and a negative correlation pattern with sampling age (P<0.05). Conclusion: In the preterm period, both fT4 and TSH seems to correlate significantly with various perinatal factors and clinical presentation. We recommend that early fT4 screening should be included in the screening for hypothyroidism in preterm infants.
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