Shenkman L, Hollander C S
J Nucl Med. 1975 Oct;16(10):955-6.
The applicability of the effective thyroxine ratio (ETR) was assessed in euthyroid neonates, infants, and children. ETR determinations on cord blood fell within the normal adult range. In contrast, ETR values of newborns age 4 hr to 2 days were all elevated (1.17 -1.37) and within the hyperthyroid range for adults. Values in infants age 2 weeks and older and in children age 1-15 years all fell within the normal adult range. These findings suggest that the ETR can be used as an ancillary measure of thyroid function in infants and children. In the immediate postpartum period, however, ETR values may be normally in the adult hyperthyroid range.
在甲状腺功能正常的新生儿、婴儿和儿童中评估了有效甲状腺素比率（ETR）的适用性。脐血ETR测定值落在正常成人范围内。相比之下，出生4小时至2天的新生儿ETR值均升高（1.17 - 1.37），处于成人甲状腺功能亢进范围内。2周及以上婴儿和1 - 15岁儿童的值均落在正常成人范围内。这些发现表明，ETR可用作婴儿和儿童甲状腺功能的辅助测量指标。然而，在产后即刻，ETR值可能正常处于成人甲状腺功能亢进范围内。
