title: Umbilical serum insulin-like growth factor 1 (IGF-1) in newborns: effects of gestational age, postnatal age, and nutrition.
abstract: OBJECTIVE
  The aim of this study was to determine the relationship between nutrition, gestational age, and birth weight, and serum insulin-like growth factor 1 (IGF-1) levels in newborns.
  
  
  METHODS
  The first study group consisted of sixty newborns: thirty were fed with human breast milk and the others were fed with infant formula. Serum samples were obtained from all the newborns on days one and seven of life. Seventy-two pregnant women and their neonatal cord blood serum samples were obtained in a labor ward in the study group. All the serum samples were analyzed for IGF-1 by immunoassay.
  
  
  RESULTS
  Newborns fed with human milk had higher serum IGF-1 concentrations compared to formula-fed controls (p < 0.05). Cord IGF-1 levels showed a negative correlation with birthweight (p < 0.05) and a positive correlation with gestational age (p < 0.05).
  
  
  CONCLUSIONS
  These findings suggest that IGF-1 levels during the neonatal period are influenced by gestational age, birth weight, and nutrition.
authors.affiliation: Department of Pediatrics, Cumhuriyet University, Sivas, Turkey. deryabuyukkayhan@hotmail.com
authors.forename: Derya
authors.initials: D
authors.lastname: Büyükkayhan
authors.forename: Fatoş
authors.initials: F
authors.lastname: Tanzer
authors.forename: Taner
authors.initials: T
authors.lastname: Erselcan
authors.forename: Ziynet
authors.initials: Z
authors.lastname: Cinar
authors.forename: Ozlem
authors.initials: O
authors.lastname: Yönem
mesh_terms: D015415:Biomarkers / Q000097:blood; D001724:Birth Weight / Q000502:physiology; D005260:Female; D005312:Fetal Blood / Q000737:chemistry* / Q000378:metabolism*; D005865:Gestational Age; D006801:Humans; D041943:Infant Formula / Q000008:administration & dosage / Q000378:metabolism; D007229:Infant Welfare; D007231:Infant, Newborn; D007234:Infant, Premature; D007236:Infant, Small for Gestational Age; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D008297:Male; D008429:Maternal Welfare; D008895:Milk, Human / Q000378:metabolism; D009752:Nutritional Status / Q000502:physiology; D011181:Postnatal Care; D013223:Statistics as Topic
chemical_list: D015415:Biomarkers; D007334:Insulin-Like Growth Factor I