title: Serum amyloid A (SAA) protein and high-sensitivity C-reactive protein (hsCRP) in healthy newborn infants and healthy young through elderly adults.
abstract: OBJECTIVE
  To determine the levels of serum amyloid A (SAA) protein and high-sensitivity C-reactive protein (hsCRP) in different age groups.
  
  
  METHODS
  Serum samples from 70 healthy newborn infants, 80 blood donors and 81 healthy elderly individuals were analysed using a nephelometric method. The 231 samples were grouped as follows: 35 umbilical cords, 35 newborns, 48 young adults, 28 middle-aged adults, and 85 elderly adults.
  
  
  RESULTS
  Serum levels of both SAA and hsCRP were lower in umbilical cords than in the newborns and young, middle-aged and elderly adults (p<0.0001). The SAA and hsCRP levels were comparable in newborns, and young and middle-age adults, but higher in elderly adults (p<0.0001-0.03). SAA (r2=0.159, p<0.0001) and hsCRP (r2=0.059, p<0.0001) were positively correlated with age and to each other (r2=0.385, p<0.0001).
  
  
  CONCLUSIONS
  Serum levels of SAA and hsCRP in umbilical cord blood are close to the detection limit and lower than in the other age groups investigated. The elderly have generally higher levels than the younger age groups, which require higher decision levels in inflammatory diseases, including infections. In newborns and young and middle-aged adults, the lower decision levels of 10 mg/l for SAA and 5 mg/l for CRP are suggested.
authors.affiliation: Department of Medical Sciences, Infectious Diseases, Internal Medicine and Clinical Chemistry, Uppsala University Hospital, Uppsala, Sweden. anders.lannergard@akademiska.se
authors.forename: Anders
authors.initials: A
authors.lastname: Lannergård
authors.forename: Göran
authors.initials: G
authors.lastname: Friman
authors.forename: Uwe
authors.initials: U
authors.lastname: Ewald
authors.forename: Lars
authors.initials: L
authors.lastname: Lind
authors.forename: Anders
authors.initials: A
authors.lastname: Larsson
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002097:C-Reactive Protein / Q000032:analysis*; D005260:Female; D005312:Fetal Blood / Q000737:chemistry; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D000685:Serum Amyloid A Protein / Q000032:analysis*; D013548:Sweden
chemical_list: D000685:Serum Amyloid A Protein; D002097:C-Reactive Protein