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. 1980 Nov 22;123(10):1007–1013.

Relation of cord blood thyroxine and thyrotropin levels to gestational age and birth weight.

F S Prato, L Reese, G J Tevaarwerk, R Mackenzie, C J Hurst
PMCID: PMC1704969  PMID: 7192594

Abstract

A program of screening cord blood for evidence of primary neonatal hypothyroidism was implemented in a general hospital. In 13 months 3456 newborns were screened: the thyroxine (T4) and triiodothyronine (T3) concentrations were measured in cord blood samples, and when the T4 level was below 8.0 micrograms/dl thyrotropin was also assayed in the sample. The two-tier program was effective. One hypothyroid newborn was detected and treated. More boys than girls had T4 levels below 8.0 micrograms/dl (9.7% v. 4.7%). The T4 level correlated with birth weight slightly better in the boys (r = 0.28 v. 0.21), and in the boys this correlation was stronger when the birth weight was lower. Regression analysis of the data for 54 sets of twins indicated that the T4 level was more strongly related to gestational age than to birth weight.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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