A relationship between neonatal breast size and cord blood testosterone level

G. L. Francis, W. H. Hoffman, R. R. Gala, J. C. McPherson, Julie Kay Zadinsky

Research output: Contribution to journalArticle

7 Scopus citations


The present study was performed to determine if any hormone measured in cord blood correlates with the size of the neonatal breast or the presence of galactorrhea. A total of 144 term newborn infants were examined. Estradiol (E2), progesterone (P), testosterone (T), and thyrotropin (TSH) were determined by radioimmunoassay (RIA), and prolactin (PRL) was determined by both RIA and biological activity (BA). The female breast (8.5 ± 2.0 mm) was found to be larger than that of the male (7.8 ± 2.1 mm, p < 0.05). The only hormonal difference between sexes was a higher T level in the male infants (8.0 ± 3.0 nmol per L vs. 5.5 ± 1.9 nmol per L, p = 0.002). None of the other hormones measured by RIA correlated with the size of the neonatal breast or the presence of galactorrhea. The BA or PRL was widely variable compared to the PRL RIA but also failed to correlate with neonatal breast size or galactorrhea. This study suggests that T might be one factor in determining the size of neonatal breast.

Original languageEnglish (US)
Pages (from-to)239-244
Number of pages6
JournalAnnals of Clinical and Laboratory Science
Issue number4
Publication statusPublished - Aug 3 1990
Externally publishedYes


ASJC Scopus subject areas

  • Microbiology
  • Immunology and Allergy
  • Pathology and Forensic Medicine
  • Immunology
  • Molecular Biology
  • Hematology
  • Clinical Biochemistry
  • Medical Laboratory Technology

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