[A study on testosterone secretion in neonates].
Serum testosterone (T) concentrations in 106 umbilical venous bloods and 104 neonatal venous bloods, which were obtained from preterm (32-36w) and term (36-41w) infants, were measured by RIA. Cord T levels of boys were higher in preterm infants than in term infants, and those of preterm infants were higher in boys than in girls. Neonatal T levels of girls decreased following delivery. But those of boys increased after 10 days of life. T levels were higher in boys than in girls at 11-30 days of life. Differences between preterm and term infants were not significant.
D005260:Female; D005312:Fetal Blood / Q000032:analysis; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D011863:Radioimmunoassay; D012737:Sex Factors; D013739:Testosterone / Q000097:blood*
D013739:Testosterone