title: Serum neuron-specific enolase levels in preterm and term newborns and in infants 1-3 months of age.
abstract: BACKGROUND
  Elevated serum levels of neuron-specific enolase (NSE) was initially assumed to be specific to neuronal tumors (particularly neuroblastoma), but is now known to accompany nontumoral conditions and tumors other than neuroblastomas. There is a need to establish normal ranges for NSE, especially in early infancy. The aims of this study were to determine reference values for NSE in newborns and young infants and to assess whether NSE levels in early infancy (i.e., preterm infants and term infants) differ from the adult reference range for this enzyme.
  
  
  METHODS
  We enrolled 140 healthy babies, which included 40 preterm newborns (3-15 days old and born at 28-42 weeks gestation), 40 term newborns (< 1 month old and born at term), and 60 young infants 1-3 months old (n = 20 per subgroup of 1-, 2-, and 3-month-old infants). The determination of NSE levels was performed by the electrochemiluminescence immunoassay (ECLIA) method using the Elecysys 2010 device (Roche Diagnostics, Mannheim, Germany). The mean serum NSE levels for the preterm newborns was 21.83 ± 15.06 ng/mL [95% confidence interval (95%CI), 16.95-26.71 ng/mL]; term newborns, 18.06 ± 12.83 ng/mL (95%CI, 13.94-22.19 ng/mL); and young infants, 9.09 ± 4.38 ng/mL (95%CI, 7.96-10.23 ng/mL). The mean serum NSE level for infants 1-3 months old was within the ECLIA kit's normal range (4.7-18 ng/mL for adults), whereas the corresponding means for the preterm and term newborns were higher (p < 0.001, for both).
  
  
  CONCLUSIONS
  Our findings suggest that adult reference values should not be applied to the preterm and term age groups.
authors.affiliation: Division of Neonatology, Department of Pediatrics, Baskent University Faculty of Medicine, Ankara, Turkey. Electronic address: doktoraslihan@gmail.com.
authors.forename: Aslihan
authors.initials: A
authors.lastname: Abbasoglu
authors.affiliation: Division of Pediatric Oncology, Department of Pediatrics, Baskent University Faculty of Medicine, Ankara, Turkey.
authors.forename: Faik
authors.initials: F
authors.lastname: Sarialioglu
authors.affiliation: Division of Pediatric Oncology, Department of Pediatrics, Baskent University Faculty of Medicine, Adana, Turkey.
authors.forename: Nalan
authors.initials: N
authors.lastname: Yazici
authors.affiliation: Department of Biochemistry, Baskent University Faculty of Medicine, Ankara, Turkey.
authors.forename: Nilufer
authors.initials: N
authors.lastname: Bayraktar
authors.affiliation: Department of Biochemistry, Baskent University Faculty of Medicine, Ankara, Turkey.
authors.forename: Aysegul
authors.initials: A
authors.lastname: Haberal
authors.affiliation: Division of Pediatric Oncology, Department of Pediatrics, Baskent University Faculty of Medicine, Adana, Turkey.
authors.forename: Ayse
authors.initials: A
authors.lastname: Erbay
mesh_terms: D000328:Adult; D000367:Age Factors; D016022:Case-Control Studies; D005260:Female; D005858:Germany; D005865:Gestational Age; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007234:Infant, Premature; D007235:Infant, Premature, Diseases / Q000201:enzymology*; D008297:Male; D010751:Phosphopyruvate Hydratase / Q000097:blood*; D012016:Reference Values
chemical_list: D010751:Phosphopyruvate Hydratase
keywords: infant; neuron-specific enolase; reference values